I hate my life and high school. What should I do?

I'll try and shorten my life story, even though its really long and complicated. I'm a sopre at a high school, no one likes me in this school, everyday I get dirty glares walking down hallways, I have no friends, I use to have friends last year but thats because I was best friends with these 3 popular girls. One of those girls turned against me by calling me a slut, , devil and a whole bunch of other things. Her 'groupie' followed, everyday I get called a skank by them. (Her reason for this is because I supposily lead one of the guys she liked on, but I had a boyfriend, and I told him that, and he was okay, said he understood I didn't have the same feelings for him.) Yet she still hates me to this day, everyone in high school, and i mean EVERYONE is friends with these girls. People always tell me to just ignore them and they'll go away, its been over a year, I've had enough, I don't do anything to them, and I try not to make eye contact with those girls, their friends(which would be pretty much the whole school) would come up to me and tell me all these nasty things they say behind my back. My best friend who doesn't go to this school, knows what I'm going through, shes my only friend, and shes moving to Texas soon. I'll have no one left, I try to make friends everyday but I just end up alone at the end of the day, or sitting alone at lunch. I was looking into online school but my parents refuse to let me do that, they said 'its not a real school, you'll ruin your college opportunity.' and that I should 'suck it up, its not that bad.' I would love to transfer schools, maybe even a private school. People say your high school year is suppose to be a good memory, and not hell. Yet, I feel like I'm already in hell. I'm doing my best to just concentrate on homework and school but whenever I come home, I just lock myself in my room and cry.