I punched some kid in the nuts first thing in the morning everyday for a year.
Why did you punch him all the time?
I just always felt like doing it at the time.
It's wrong to punch people, especially for no reason other than you wanted to do it. You are both mentally and physically hurting them a lot by hitting them. You should stop doing it and apologize to him for your behavior.
It's alright. I'm not worried about the kid doing anything back.
Even if you don't think  he will retaliate, you shouldn't punch him. It is wrong and you could get expelled.