Some one please help me:'(?

There's this girl.. and she was my friend but now she's saying that my hair is greasy and calling me fat and ugly.. she's always been like this.. and if i 'snitch' on her she always calls me more names like 'pig'.. and she's 'popular' aswell.. and i also got dumped by my boyfriend 2 weeks ago.. and im really depressed and i just want to kill myself because it feels like everyone in my school hates me cos i get bullied so much.. and my ex is ignoring me.. i still love him and i always cry about it! some one PLEASE help me:'( + also like everyone in my year takes the piss out of me and it really hurts.. but i cant tell of them cos then i would just get more bullied!