i dont want u to be in trouble. what is your idea of hard? i think it be a big improvement to stand up for yourself, but also you dont want to get in trouble. I suggest seeking help from the headmaster first, and if that dont work let them know that you cannot stand them anymore, and will not allow them to mess with you and if they do you will not let them off e.g tell headmaster again, and say how serious this is affecting your study. they have to be taught a lesson. Its just plain wrong to pick on a quiet person. i know what you feel and i had experience similiar thing once when i was at school.