I was in a fight caused by my own acts and peer pressure
Why did you start the fight? Were you forced to?
I don't know why the fight happened. And I haven't received any kind of punishment for what I've done.
Fighting for now reason often signals an underlying issue within a relationship, such as the one with your peers. Try to talk to them about this and see if you can make amends for your actions.
I don't want to tell anyone. I already escaped consequences so I just want to pretend nothing happened.
I don't know the full scenario of the fight, but if someone was hurt, you have duty to report what happened and to take responsibility for it. Don't allow yourself to get caught up in a brawl and remove yourself from the situation next time.