I can't cope with school anymore.

Lily-Anne
I don't know where I can post this, but it's something that has affected me for so long, and it has become the biggest issue in my life. 
I can't cope with school anymore. It isn't a petty excuse to get out of education and be a bum, as that is the last thing that I want to be, but my gut wrenching hatred for school has got to the point where I cry every morning at the thought of going back. 
I can't handle the pressure to be better, the constant mind numbing voices of the teachers pushing, pushing and pushing you to your breaking point without a care for your health, or how you are coping. 
The feeling like you're alone no matter how many people surround you, because you can't connect to any of them no matter how hard you try. 
Struggling to eat around anyone due to past bullying, and then feeling disgusting afterwards. 
Sitting in the bathroom hiding from your sister whilst you tear your wrists to shreds, trying desperately not to cry because you know she wouldn't understand. 
Having to smile when they tell you they are here to keep you safe, all the whilst you are hiding the blood stains and internally screaming. 
My depression and anxiety have became so bad the mere thought to stepping outside sends me into mental hysteria and panick attacks, and yet I am still required to boost the grades I have already achieved.
I can't cope any longer. 
I don't know what I want to do with my life, but right now I know school is the worst place for me to be, it's the place every emotion intensifies and every urge becomes stronger. 
What can I do? 
In the UK I have to stay in full-time education until I'm 18, and I am sure it will kill me in every sense. 
I need to leave, yet nobody will let me. 
What can I do?