Katie, talk to your parents, school counselor and perhaps the police.
My abuser is calling me a rapist and trying to turn everyone against me and I can't take it anymore?
Then talk to someone about it .. Expose them for what they are .. No matter what this person tries to lead you to believe .. Believe one thing .. You cant move forward until you make the first move. Don't believe the nonsense .. Trust the truth
First off avoid his person. Secondly, if you do run into them, record any interaction you have with this person. Tell someone in authority what is going on.
Fight back. Climb out of the shadows and destroy him.