I punched some woman in the face since she just ran into me in her car at a junction
Why did you punch her
She hit me and then drove off without giving her info. She didn't hit me hard, though, so I regret doing it.
If you were hit by a car, you should seek medical attention. Not getting attention for an injury can cause it to worsen as time goes on.
I tried, but no one gave a shit about my wound. It ended up not being serious though.
I'm glad that you weren't hurt, and that you have realized that it was wrong to resort to violence, even in a situation like that.  Even though you weren't seriously hurt, a hit and run incident like this is a serious offense, and it should have been reported.  However, you would still face legal action for assaulting the woman.