My friends bully me badly, I don't know what to do?

[Julie]

I have a group of friends and get bullied constantly everyday and im suffering badly from this. I've been getting bullied by them for over 3years now by them. They only like me when they want something or one of the group is off poorly. I can never have a happy day, i always get things thrown at me, called names, having rumors about me, getting the blame for things all the time, I can't even talk without getting abused about me voice, about how i look, about what i eat (im not fat but i eat two chocolate bars in my lunch). In lessons I get things shouted at me by them. I started crying a lot in the toilets and became depressed and always waking up crying hoping i was in heaven. I've told them to stop thousands of times and explained to two of them how i feel about it, they're all sweet over text but then the next day in school or class they'll shout out what i said and then shout swear words at me. Now some other people have started joining in with them. They bully me for their own entertainment to get banter. I hate waking up in the mornings. I moved school 4 years ago but only spent a few months in that school because i preferred my old school. I can't make new friends because each new friend i've had one of my 'friends' will go say something awful about me to them then i loose them or even if its over facebook theyll go add them and spread things about me. I've told my parents but they constantly say "you've only got a few years left just get your head down" but its not that simple really is it, I'm being bullied constantly and I can't handle it anymore. If i didn't hang around with them i would be a loner and wouldn't be able to hang around with anyone, I'd end up in the toilets eating and crying. I'm not constantly paranoid, no matter how much i tell them to stop they won't listen. I now have suicidal thoughts every day i wake up. I don't know what more I can do?
I am constantly paranoid*