Astro seconds all of the above advice (or most of it, anyways…) and adds this:
Iblis, I fully sympathize, and I know exactly where you’re coming from (I was 25 before I ever had a GF, and not from lack of trying)!
Here’s what I learned about that; and I know it sounds cliche, but it is true:
You have to make yourself happy, no one else can do it for you! Once you accompish this, you’ll be surprised at how many men will want to be in a relationship with you.
Understand that men think very differently than women… IE: most men are usually thinking about sex/food/sex/the theme song to Gilligan’s Island/sex/having fun. Women are thinking about, uh, well… actually I dunno what women are thinking about, but it’s NOT what men are thinking! BEHOLD! I generalize with broad strokes! 
Emotional needs are weird for men: we are socialized to express no emotional needs (Grunt! I am MAN! I need nothing! [sup]Well, maybe a little sex now and then… and beer, of course…[/sup]), and when we are asked to help with the emotional needs of someone else, it scares us.NB: Astro is a man, can hunt down wild animals and eat their flesh RAW! And, furthermore, can take anyone here!! He DID NOT admit fear! NO, he DID NOT!!!
Men do not admit to having emotional needs, and when someone else does, it makes us very uncomfortable
As soon as a man hears “I need you for (insert emotional need here).” The man, unless already deeply in love with you, will think ‘emotional need=no fun/fear!’ and will generally bolt. That’s why so many people say that a woman should pretend that she doesn’t need the man, and let him do the chasing. Once he is deeply in love with you, then you can start unveiling emotional needs relatively safely (but do it gradually, wouldn’t want to shock the poor sucker!). Again, this is a broad generalization, and YMMV… it didn’t work that way with me, but I was weird and desperate when I met GF #1… Fiancee #1 has been unveiling emotional needs for the past 3 years, and it weirds me out big time! But, by now, our lives are so intimately entangled that there is no “me” without “Hyun Jeong” (she’s Korean, therefore weird name…), her problems=MY problems, so it’s too late to bolt (don’t tell her I said that, or I’m a dead man!)!
I guess my advice boils down to this: try not to worry about it and be happy! For a man looking at you across a smokey bar, happy=fun & attractive and very happy=fun & very attractive. And once you become involved with a man, keep your emotional needs to a minimum until it is very clear that you and he are essentially one entity.
I hope this didn’t sound too harsh, as it really wasn’t meant to be… and I hope it helps, at least a little… 
Disclaimer:
The previous advice was derived from BROAD generalizations of the behavior of the various sexes as observed by the writer, and YMMV! The writer makes no claim of accuracy, intelligence, or deep insight. In fact, the writer has, on more than one occassion, been accused of having his head up his ass!