Help. my classmates think i am a thief!!?

Wow that sucks. You know the truth inside yourself. Did you take them? If you didn't, then it doesn't matter what anybody thinks about you. Tell them that you didn't take them, and if they say you did, tell them you're done trying to convince them. They can't prove it, and you didn't take them. It will pass. If it gets bad, I guess you could buy her new ones, but It will be pointless since you didn't take them. Tell her to go away and stop making false accusations. School can be tough, but not really any better advice I can give you. You're gonna have to wait for it to pass. Things like this blow over in no time. If you want, you could talk to your parents. Maybe they could help you a bit too.