It actually does my heart good to see people unafraid to use the word “can’t”. Some of us just aren’t wired to do certain things. Even if we could do some of them if we devoted all our attention to them, would it be healthy to do so? Two of the three “can’ts” I mentioned I’ve had no trouble working around. Not being able to read signals of romantic interest could have been a problem to this day if I hadn’t encountered the right person at the right time.
All of me is long compared to most women LOL. I just tried to do a pushup, unsuccessfully. However, I can lift heavy things that many other women cannot.
I can’t do it either.
Hope you’re using your legs to lift those heavy things. 
Leg strength may actually be why you’re able to do that.
I can’t snap my fingers.
Calculus was a mystery to me, while even higher algebra was a snap.
I cant sleep all nite without getting up to use the potty.
Make that two hours for me.
I can’t eat eggs. They’re fine if mixed with other ingredients, as in a cake. But not on their own. It’s not a problem in my daily home life, since I have no eggs in my house, but it’s difficult at a diner, where almost every breakfast dish comes with “two eggs, any style.” Thankfully, if they have toast, bacon, tomatoes, and lettuce (and they always do), I can get a diner breakfast of a BLT sandwich and home fries, even if it’s not on the menu.
I can’t braid my hair straight down the back of my head, and I can’t do a French braid at all.
This only matters because I’ve had hair long enough to braid (and mostly long enough to tuck in, if not actually sit on) for 40+ years. All this time I have a side braid over my right shoulder, or 2 pigtail braids.
I can’t even
I can’t read the list of topics because the web designers here think it’s cool to use a very pale font. Almost grayed out, but not quite – grayed is what they do to the Edit button.
I picture web design as a bunch of millennials nudging each other and saying “Look what I just did – nobody will ever find that”.
I can’t recognize faces, which is a real thing…
It makes watching movies fun–I always struggle to distinguish the good guys from the bad guys.
Exhale through your nose as you submerge. Then don’t do any more breathing until you resurface. 
I can’t braid my hair or put barrettes in it, or create any style fit to be seen in public. My hair does not want to do those things. I always thought it just wasn’t long enough, but it’s very long now and NOPE. Still not having it.
Can’t drive.
Can’t do math beyond the times tables.
Can’t do push ups, sit ups, or chin ups.
Can’t skip a rock across water.
Can’t sing.
Can’t draw a picture.
Don’t ever need to do any of that shit, so it doesn’t bother me all that much.
I can’t fill in the blank. Literally. I have mild aphasia, and often struggle to find a word or a name, including common words and names of people I know well.
Me too! I am mystified how the whole “amber alert” thing can possibly work. You expect me to notice a car of a particular make and model, as I’m trying to drive? Are you mad? Obviously some people can do that. Me, I turned the alerts off.
Just don’t breathe. Breathing is voluntary when you think about it.
I don’t do the crawl, because I always do get some water up my nose. All that splashing and bouncing my head up and down… Hate it hate it hate it. But other strokes, like the side stroke, are much calmer and it’s easy for me to keep water out of my nose. I stopped doing the breast stroke when they changed the kick (yes, a million years ago) but I like to wear flippers and do a gentle flutter kick while using approximately a breast stroke arm action.
If you have trouble not breathing in water, recreational swimming probably isn’t for you, but you might want to practice that ice bucket thing just to learn a useful skill in case you ever find yourself in water. But I wonder if you lack the mammalian diving reflex that:
This reflex involves apnea (loss of drive to breathe), slowed heart rate (reflex bradycardia), and reduced blood circulation to the extremities such as fingers and toes (peripheral vasoconstriction)
(the quote is actually from the article on infants swimming, since it had a more succinct statement than the main article on the dive reflex.)
I think most people who swim don’t really have to think about not taking a breath while underwater. The dive reflex takes care of that in most cases.
Can’t snap my fingers.
I share a lot of deficiencies named here; can’t whistle, can’t do math beyond simple algebra, can’t navigate. I don’t know if that makes me sad for us all or just happy for myself 
I can’t back into a parking space
I can’t roll a fajita
I can’t knit (though I can crochet, embroider, cross stitch, etc. . .)
I can’t play video games
I can’t hoola-hoop
I can’t tie a noose (discovered that while trying to make a Halloween decoration)
I can’t whistle in any way - not just with my mouth nor using my fingers.
I can’t roll my R’s or make a telephone ringing sound.
I have a very bad sense of direction. Even coming out of a hotel room, I’ve gotten lost.
I can braid my hair if it’s on the side of my head but I cannot figure out where my fingers should go if I try to braid my hair in the back. I wouldn’t even attempt a French braid.
I avoid parallel parking like the plague.
When looking at a long number and there are more than 3 zeros in a row, I can’t tell how many zeros there are by just looking. I have to use my finger to count them.
I can’t stop this feeling deep inside of me…