Tired of Bully's and School :(

I am 15 years old and I live in Spain. 

I dress alt, and by alt I mean goth, I think. I like wearing white and black, mini skirts, skirts with lace, ripped thights and platforms. I am skinny and tall, and people sometimes tell me to do modeling. Sometimes, people say that I am gorgeous, but I cant see it, I consider myself pretty ugly :(

Why? 

fBecause every day I have to deal with people judging me, talking about me behind my back and literarly laughing at my face.

Today, Four boys told me that the where going to wait for me at the school gate to hit me. Half and hour later, some girls at the stairs started laughing at me and calling me a slut, a bitch and a whore. 

I like being kind to everyone with no exceptions. I know that school is hard for everyone so I try to make everything easy for anyone. I like to talk to shy people, so that they aren't alone. I try to be the best person possible so everyone can be happy.

But for some reason, almost everyone hates me. I tried to talk to my homeroom teacher, the orientator, the headmaster.. EVERYONE, and they dont care. (I cant talk to my parents about that because they are high-key abusive)

I dont know what to do :( I dont understand why they all hate me.