I want to punch a guy younger than me
Why do you want to resort to violence?
Because he once insulted my school grades
Even though you may want to punch this person as revenge, it is not a good idea. It is even worse to punch someone who is younger than you.
It's fine, I can't wait for him to grow up and become better so I can punch him.
I get that he is frustrating you, but I do not think that violence is the answer. It is not okay to stoop down to the level of using violence.