This is embarrassing

I broke up with a friend a year ago and she talks bad about me to everyone so now the school knows our relationship problems. She'll tell people about my body, my past experiences, etc. and she'll twist it to make it seem bad. She even got her one friend to call me out In the hall and everyone laughed at it. Whenever her friend group seems me they stare and laugh at me. My friends even send me snapchats of the people I don't like because she's friends with them. Most people in the halls when they pass by me they stare me down or they look away. Even teachers do it and when someone's talking to me they pass by and give them a weird look for talking to me.