Jesus! I had a similar experience around your age. The annoying guy in my class kept kicking my chair. I told him to stop and his reply was: "Like that?" and kicked again.

So, in a moment that I can't explain, I got up from my seat, grabbed the chair and smashed it on his desk. Both my chair and his desk broke. He got hit with the splinters. Nothing serious.

I had to write a report and I remember that I wrote: "I broke the desk and the chair, so I would not break his skull".

Never again did he mess with me.