What to do? friend trouble!?

kay so first of all my name is Anna-Marie and like right now i am a freshman in high school and last year i was kind of friends with this girl now this year were like BFF'S! cause we have like 6 cles together. Shes a christan and recently i told her i had a crush on this guy and she calls me pretending to be him but i know its her i tell her to stop and ignoring the calls but she doesn't stop! so okay then she and this dude (who gets on my nerves) they were saying i farted when really i didn't! So i got mad at her she cussed at me for telling her to stop and i told her i didn't wanna be friends...anyways after thanksgiving break we became friends again and like we said sorry...3 weeks later in ICT cl she was saying ewww thats ugly just like ANNA-MARIE! im like...OMG! the boy who sits between us was telling me how she was talking smack bout me! i got home and cried that day my mother said she is a bad friend so then the next day she started acting nice im like okay whatever...then i got on FB like on friday she was all like hey u ugly! im like would u stop being mean shes like shut up you ***** then she kept calling me calling me a loser and a ****** im like ???? so then i told my friends bout her and told me to ignore her..now we go back to school January the 4th and i am really nervous cause i told her everything my secret crush...everything! now im scared to go to school i blocked her and unfriended her on facebook ugh im soo scared...:( what should i do! im only 15!