I punched a wall a couple days ago and there's a dent in my knuckle and it's swelling but it doesn't hurt unless i touch it. what's wrong with it?

The wall always wins: I assume you discovered this. You should get an xray of your hand, since punching out walls can lead to fractures. Perhaps, consult your physician about anger management issues.

Self control: Hi. I'm glad it was a wall and not a person, but still losing control of yourself and behaving irrationally can hurt someone, including you. Please consider your ability to control yourself, and seek counseling if indicated. As for the hand, an X-ray to make sure there's no fracture would not be a bad idea. Peace and good luck.