I need help. On the brink of breaking down

Okay, so prepare for quite a story. Sorry for making আপনি guys listen.

I'm a new student who has been in the school for almost a বছর and there's this really mean and bossy girl who everyone used to dislike. Suddenly, she changed and my besties started to like her. She copies every action they do. Ever since, my besties started to slap me and abuse me. I figured that i'm kinda a doormat [need help on this too]. So, i decided to organise a trip with my besties and didn't invite the mean girl. Huge mistake. Somehow, the mean girl found out and decided to organise the same trip and invite everyone except me. And now, there's another girl organising the same trip. I'm starting to get paranoid. Also, I have সঙ্গীত practice. There's another girl that everybody dislikes. She keeps blaming me when our teacher scolds us for messing up. She takes my phone and glasses and shakes me on the shoulder till at one point, I fell. It's really irritating. I need help :/ Sorry, for making আপনি guys read the entire story. Just hoping someone out there could help.