Im so confused WHY?! people are so mean :(?

Okay, well the girls at schools are so mean. They write on my locker "go to hell abby" like 3 times a day! and they wrote in the bathroom 5 times "go to hell abby" and "abi has cancer she just doesn't tell anyone because she doesn't want to say she wears a wig" and cancer is really close to me since my best friend died for hepoblastoma liver cancer on December 30th so i didn't think this was funny at all. Im not a nerdy person. Im super athletic, all the guys like me( well not all of them but they ask me out a lot and its not a joke) and my parents tell me they are just jealous but really i dint believe them. Then they spread that i was lesbian and ugh it just makes me really upset because i dont know how to handle it or get them to stop because they dont understand how it makes me feel because they are in my situation. Yes, they make me cry. They make me feel low. They make me feel worthless and like i should be in heaven with my friend Katy. NO i am not thinking about committing suicide and please dont tell me to go to a therapist because i am really not interested. I just dont really know how to deal with them. Please help. Thank you!