Girls at school being abusive?

So i'm a 17 year old guy who's in year 12. In all five of my A-level subjects I have these 3 girls. They go out of their way to be as mean to me as possible. One of the girls there went to my old school and has decided to tell everybody just how "sad" I am all the time. Today we got paired up to write an essay and she made the biggest deal out of it physically possible. When I checked my facebook a while later she'd posted status clearly aimed at me. And then a few minutes ago posted wall to wall why im such a pathetic person who did not go to prom and has not gone to one school social event. I dred going in tomorrow because of all the bs i will get. I've spoken all of three words to her in my life. Moving classes is not an option

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