Juggling. I want to be able to juggle. Have tried so many times and failed so many times. No good reason, I just really want to be able to do it.
I'm quite willing to draw badly and sing badly, find those enjoyable even without talent. They seem like human things everyone does, and if I practice they get better. But for whatever reason, I am so jealous of those with reflexes that let them snatch balls out of the air, and haven't been able to learn this. When I practice I don't get better and it's frustrating.