Hi cheater123
Firstly i'm a mum to a girl who like you is sitting her GCSE's and it is very stressfull ,you sound very desperate , and say its not a help line that you need ,but the samaritans will listen to you , or perhaps a close friend ,or even your G.P if you are 16 then you dont need to have a parent with you to go to the G.P .
Try and stay focused on your revision for your GCSE's i know it's hard ,but you know somethng problems have a way of sorting themselves out .
Good Luck with your GCSE's
Takecare