Being bullied, please help?

[Hannah]

Whenever I walk into the room when I go to school, everyone looks at me like I did something. They all go quiet. This girl and her clique gives me looks and then laugh at me. My books got stolen by this other girl and her group. On facebook my friend put a video up of me talking to her on webcam, then she started saying things to people things I didn't say. People started putting mugshots of me on facebook and they are secretly taking pictures of me behind my back in lessons.They laugh at me and I'm always in detention for losing my books when they are actually stolen. I spoke to the teachers, and the teachers don't believe me. They all think its an excuse to get out of detention. Because all their students are lovely..... My mum let me see a psychiatrist to see if she could think of anything to do about it. An option was to move schools. We can't do that because there is one high school in the area and my mum can't move because of her charity work. The other schools are an hour away or more. I can't home school because my mum doesn't have the time or money.... What should I do?