Why do people randomly start drama.?

[Tabitha]

I am 14 years old, and a freshman. Almost every single one of my friends turned on me this year, and i have absolutely no clue why.?! They all cornered me at school the other day, threatening to fight me. They were all yelling at me saying i play people and stuff. I haven't done anything to them.! Then later that night i went to the casino and they were there and they were stressing me out so bad that i fainted and the EMT had to come and everything and they just said i was faking and that they were embarrassed to know me. I was even on a stretcher and i had a neck brace on. They didn't care at all. My best (X best friend) said she wish she got it on video so she could post it on YouTube so she could make fun of me. WHAT DID I DO AND DO I DESERVE THIS.?!