at my school sum kids are being rude to me what Sud i do ?

whatever you do don't lower yourself to their level. that means that you don't be rude back to them. they don't know better, they weren't raised correctly. tell your parents about what is going on and have them talk to your principal and your teacher about it and see what they can come up with to stop this unacceptable behaviour. my son went through the same thing when he was about your age and it continued until i stepped in and had a talk with my sons principal when i told him that i was holding him responsible if my son got injured in anyway and that i would sue him,the teachers and the school district i finally got the behaviour stopped towards my son. a bit drastic i understand but that is what it took with that situation.