I'm in trouble from lies an rumors from girls please help.?

I don't know what problems these girls have got with me, but they HATE me!!. I'm in college and don't know anybody really. All these girls just know each other and just love to try and bring me down. I'm really slim and they always Judge me on it, and call me names, like Stick insect, anorexic ***** and so on...I know that sounds so petty but It doesn't bother me at all. What bothers me is they are reporting me, making stories up blaiming everything on me and getting me in to a lot of "trouble". Once they all were just dropping litter in the halls and the teacher came in and said who ever dropped this mess can pick it up now. and they all said "it was Naomi. I had to clean it all. Also a parent came in and complained about me for threaten her daughter because I grabed her by the throat... so I had my EMA taken off me (money) and a warning (I did nothing to this girl). I don't want to transfer because I don't want to show them it's bothering me. They don't bother me, what really bothers me is getting in trouble by staff who are taking my money off me for something I haven't done and taking grades or whatever they do when I just want to do my best. I know this sounds petty but you have no idea what it's like. My own mother is on to me from the tutors ringing home. I don't know what iv'e done to provoke these girls to doing this. I'm really quiet and I think thats why.