The stuff I suck at amounts to a list of buts, to wit:
I’m reasonably athletic – good fencer, accurate frisbee thrower, used to play soccer, rock climb – but I can’t throw a football to save my life. Many people have tried to teach me, and all gave up.
I’m a pretty good dancer – ballroom (swing, foxtrot, waltz, etc.) especially – but I could never get the hang of tap.
I’m a decent self-taught musician – composition, arrangement, singing, etc. – and while I’m a passable piano player, my left hand is like a frozen hunk of meat. Pinky and thumb an octave apart, and that’s it.
This one’s kind of esoteric, but what the hell. I’m a pretty good actor – Shakespeare, modern, mime, whatever – but mask work did and does elude me.
I’m good at analytical thought – I skated through math curricula up until my sophomore year of college, and I’ve able to pretty easily teach myself technical stuff, like DHTML and JavaScript – but there’s a certain level of complexity that’s like a big brick wall. Trig? Fine. Calculus? Don’t remember any of it, but at the time it was no sweat. Beyond that? Makes my skull melt.
There’s more, but you get the idea. In general, I think I’m fairly well-rounded in my skills and knowledge, but with every general discipline there’s a weird black hole, some small, some large, some a self-contained area within and some a clearly demarcated boundary, that denies my access.