1: My knees are double-jointed- so landing "correctly" hurts worse than landing "wrong." Or so I thought- my "correctly" is slightly off.
2: I have absolutely no self-confidence and second-guess my every move. I expect to be wrong, and consider myself to be wrong when I'm right most of the time. I ignore what I can do and focus on what I cannot do; I view my accomplishments as corrections of errors, and nothing more.
The second one's going to be a lot harder to fix.