I had to buy school chairs

I am not a bully, however, I have to admit that I have my moments when I lose my temper. I guess I am a bit too nervous. I do not know if I should not be treated because my outbursts of anger are sometimes excessively aggressive. Of course, I will never erupt on any of my friends because I love them a lot. However, I tend to act arrogantly towards people I either dislike I do not know. I had this situation at school where I basically got mad over a trivial thing. This guy, David, aggravated me because he told me some stupid joke about my mother. I know, people tend to say these kind of jokes and they should not be taken seriously. However, I got extremely mad and I stood up, took his chair so that he felt to the ground and I smashed this chair near him. Then I took another chair which was standing by his desk as he was sitting alone and I did the same thing with the second chair. Our teacher was not present at that moment. That guy, David, was petrified and my classroom mates were holding me not to do anything wrong to him. When the teacher came she shouted at me excessively. I obviously had to buy those school chairs back and I had to apologize to David. Those school chairs were not that cheap, however, I am glad they have not expelled me from school.