Being bullied for the first time and i cant deal! (SORRY ITS SO LONG) but please answer?

im a freshmen in high school and at the beginning everything was going so well i had great friends, good grades and i finally had someone who i liked actually like me back..but as it turns out tht someone doesnt like me, he asked me to a dance then, ignored me for the whole week and he didnt buy a ticket and i noticed and asked why? He said he wasnt gonna go anymore and he didnt even a apologize to me and give and explanation. That was the first part of everything falling apart. Now hes still not talking to me and now hes been obsessing over this other girl whos just disgustingly pretty hes doing all the things he used to do with me with her now. like at the end of the day he would wait for me and walk me to my stop. Well not anymore................ and my bff left the school yesterday. Then, today it was the worst day ive ever had....forst on the way to gym ppl were pretending like there was something on my back....and i just broke down in the locker room i was crying..then wen i finally came to cl one of the girls were walking out and actually stuck her foot out in front of me so i could trip.. and we had to do a rely race and i fell becuz my hair got into my face and i lost balance and the girls WOULD NOT shut up about it so i was like..hey its not even tht serious..and tht pissed everyone off and they all just started yelling at me and i really wanted to leave and the teacher wouldn't let me... i honestly dont know what to do...i dont even know the girls names i didnt say anything or do anything to them and all of a sudden their all just picking on me....and its not like i can just switch schools, i actually went to this school beucz i thought the kids would be more like me and some of them arent....ive nvr really been bulied too baldly before and im just wayy to sensitive to handle it..i even apologized for what ever it is tht i did to insult them and their still doing it......ive been holding in tears all day and thts soooo hard to do.