The person had been harassing me for months, and i'd even been to my head of house about him, and in that particular lesson, the teacher is useless and can't control the class, so the person was worse and they can't stop the boy, who sits behind me, from saying anything to me. Anyway, it got to a point where i felt threatened and bullied so i got fed up and slapped him one.
At the time (year nine) i was a pewny 5 ft 1 and he was 6 ft and the teacher was just glad that nothing serious happened, and that he's now stopped the harassment.