Why am i getting bullied?

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Okay so back in the days i was young people say in weird ugly fat and dark skinned. Im asian latin. Ive always been considered the ugliest so i dont have any self esteem. And i had a crush on some popular girls's bf and they started saying im a flirt a bitch nigga and more. And everyday in class my things are scattered on the floor and they talk about me. And in fb they posted a pic of me criticizing how fat i am ugly and dark skinned. They laugh at me too im isolated from them. And they made a hate group posted another pic of me saying to dip me in the acid so ill get a lighter complexion. Cuz the lighter complexion you have the prettier. And whenever i pass by the group of guys they were like hey its your gf followed by a laugh and its not even true. and from that time til now i had a social anxiety disorder.they laugh at me whenever i can sing draw dance and cook in class... Help? Thank you..