I want to punch my bruises
Why do you want to punch your bruises?
I think it will help me get rid of some emotional pain.
Though punching your bruises is not as serious as behavior such as cutting, it is still self-harm behavior and can negatively affect your health. You should work with a therapist to help resolve your need to self-harm and find healthier behavior to process through emotions.
You don't get it, I'm trying to release pain here.
Hurting yourself is not okay. There are much healthier ways to release pain and a therapist can help you learn to use them.