Words of Wisdom: if you’re concerned your nose might be too big, make sure to pose for pictures with a llama. 
There has been some great advice here already. I would have to go with the suggestion of maybe you should start to take the first step, maybe ask a guy out on a date, even if it is just to get a cup of coffee (or tea for you english folks)… You might want to look outside your normal “cirlce of friends” for someone new… or inside your cirlce of friends for that “quiet guy” that everyone thinks is “too nice”… He might just be too shy…
I think I can speak for all heterosexual guys here when I say, we would love it if the woman were to take the first step sometimes. Most of us guys are just as uncomfortable with being the instigator as you gals are. I would have dated way more often if I had been the one asked. (Not that I didn’t do OK. Just sayin’.)
One thing you didn’t mention is what are you doing to meet guys? And are you sure you’re really invisible. Some guys (like me, for example) don’t pick up interest cues - maybe you don’t, either, and lots of guys pay attention without you noticing. You also haven’t given your age.
Ever tried light flirting with someone available? Guys may pretend to ignore it if not interested, but will never object.
(You said it! I’m still trying to perfect that last part. ;))
Two right quick things:
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When you walk somewhere, do you walk to get there in less time than it might take most people, or do you stroll?
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How visible are your hands at any point in time?
I suspect that, barring personal hygiene issues you don’t seem to be afflicted with, the problem is the vibe you’re giving off.
One very simple way you can help yourself is this: the next time you’re out shopping (doesn’t matter what kind), make eye contact and smile at the first cute (or not) guy you pass that’s in your dating range. Make it brief; you don’t want to stare. Just look him in the eye as you near him and smile slightly. If it seems appropriate, you can even say, “Hi.”
Now, he may look away, frown a bit in confusion, or give off some other signal that seems negative. Don’t worry about it. After all, he could be thinking, “Is that cute girl looking at me? No, surely not.” or “Do I know her?” or he’s very shy and tongue-tied and just doesn’t know how to respond. Either way, all you’re doing is greeting a stranger in a friendly manner and continuing on your way. After a while, you will probably be more comfortable giving off “I’m available, guys” vibes under other circumstances like at parties/bars/whatever.
Hey, I’m invisible to women. I wonder if we’ve ever not seen each other.
The one of you with the llama looks like it was taken near my house! Of course, I am just down the road from you. Your nose isn’t too big.
OP by Gatopescado
(Sorry About the hijack)
That is my daughter…thanks 
(although people do tell me we look alike). The picture was taken at my friends house. She lives near Hallelujah Junction in California although her address is Reno.
What you obviously need is an obnoxious married friend with no shame to drag you over to a table of single-looking guys and introduce yourselves. Worked for me Friday night when I did that to my perpetually single friend who’s always complaining that she can never find a man, yet there was a table of nice-looking guys sitting about 10 feet away. She was drunk enough that I was able to convince her to go over with me and say hello. Turned out one of the guys had gone to the same high school she did, and had had a crush on her. They exchanged numbers and went out Tuesday night, and will see each other again Friday.
Seriously though, I think it has a lot to do with confidence and attitude. You have to put yourself out there. Oh, and one other thing. I’ve heard from a lot of guys that when they see a cute girl like my friend, they often think, “Nah, forget it. She must be taken.”
Assuming you’re in decent shape it’s (IMO) 100 percent a vibe. I was never much of a player as i married early and after divorcing tended to be very low key about approaching women. I’m 48 YO and I’ve been dating for about 3 -4 -months now and the curtain over my “nice guy” eyes has been pulled way…way back.
I’ve learned that 40 and 50 something YO women can be insanely and incredibly hot sexually. I mean we’re talking entire evenings, and next mornings of hot, passionate monkey sex lovemaking, and hours of sensuous cuddling and massages. The high levels of positive feedback I’ve gotten from women about my crazy delicious lovemaking has boosted my confidence exponentially. This in turn has entirely changed the way I see women I’m interested in, and how I view the dating landscape.
I’m in good shape, and dress well, and I’m still a “nice guy”, but I now have an entirely different erotic attitude in the way I see and relate to women I might be interested in sexually, and the odd thing is that, as subtle as this change is externally, many (not all) women strongly respond to it. They want to be seduced and desired, and approached. (if they like your looks) It’s the oddest thing. Gentle confidence is huge turn on for women.
I don’t know what the female vibe is that will get you noticed, but a nice, high quality professional head-shot and an internet ad will let you pick and choose from offers. All my dates have been via net dating and (to be honest) I did prefer the cuter and more professional looking women in asking them out for dates. I don’t know if there is any equivalent in the UK, but if you want to catch a fish you’ve got to be willing to get wet. Sometimes very wet!
Well, no one else has asked, so I will - how long have you been single?
The reason I ask is that most recently I’ve been single - not a single date - for 18 months (and DAAAAMN do I want some sex!) ahem. To me, that doesn’t seem like a long time; however, I know gals who if they haven’t been on a date in 3 weeks consider it a “dry spell”.
Is it possible you’re expectations are too high? Like you expect guys to be asking you out every day or week?
The only other thing that I can suggest is thinking about sex when you’re talking to men you’re interested it. It translates to your face and demeanor and men will pick up on it and suddenly you’ll go from being “Cute gal pal.” to “Throbbing Matress Kitten.” Trust me on this one.
Ah, you all are kind to take the trouble to reply - it is much appreciated. I feel from some of the responses that I may have inadvertantly made myself sound a bit skinnier than I am, though. I’m a UK 14 so I might have got the translation incorrect (I can’t remember if USA sizes are one or 2 sizes smaller). To make it clearer, I could definitely lose weight. I have enclosed a couple of pics, but annoyingly haven’t got any that show my figure as I am today - I’m actually about 10lbs lighter than shown here. Hasn’t really made that much difference as the weight went from all over equally. I also have breasts that are really big - this should work for me, but in practice, if I’m not careful about what clothes I wear, they just make me look dumpy and fat. Still, thanks to the pics, you can now chip in on whether I’m being neurotic or if there is stuff about me I could usefully change. I’m kind of stuck with the hair, btw - I would kill for long hair, but mine just doesn’t really grow. It’s curly as hell too - it’s like Medusa from the Inhumans in that it seems to have a will of its own. Although today I did get it straigntened for the first time ver (pic3). No bearskin rugs pics though 
To answer some other questions, I am thirty two. I have asked guys out down the years and they’ve always politely turned me down. This as much as anything makes me wonder if it’s not that I pick the wrong men, but that all men would say the same.
I posted this because I’m conscious that if anything, I’m starting to withdraw into myself and become much shyer than I used to be. I feel I’m dong stuff wrong all the time but as I don’t know what that is, I can’t change it.
Anyway, thanks again.
You’re very pretty, so it’s not that. You’re not fat. I think maybe you’re just out of practice with the art of mingling.
Try going out with a group of people and zero in on one or two people…just for maybe 10 minutes…to practice your approach.
You are definitely cute!
“Throbbing Mattress Kitten”? Damn you Alice! You’ve ruined a perfectly good pair of pants!.
Well, I’m a woman so I don’t know how much my opinion means to you, but I’d say you’re quite attractive. You have a nice figure (I’d say you’re a nice, normal in-between size), you’re well-dressed, and I like the hair (short without being a “mom” cut). In the third picture your eyes are very striking.
See - told ya. It works everytime. BTW - Promethea - I just checked out your pics. If I was a guy, I would totally fuck you. 
Promoethea, you’re* very * cute. Enough so that I’d go out of my way to know you in a socail situation. Maybe you don’t project confidence or accessibility to match your appearance, but whatever the problem may be, it *ain’t * your raw materials.
And I’m 32 and single, so I’m in the general demographic of people you’re probably looking to impress.
You’re kind of cute actually. You’ve got sensuous lips, nice eyes and some serious curves. My only suggestion might be to get a professional to do your makeup once or twice because that can make a world of difference in photos, and get at least one outdoor cheesecake shot that (tastefully) shows off your assets. Like it or not men are visual creatures. You’ve got all the fundamentals, you just need some better marketing.
This is why the WonderBra is such a big seller. Get one. Know it. Love it. It will be your friend. 