How old are you?
I am not surprised that you want it to stop, abuse of any form is very wrong. If you can give me an idea of your age, and if you are in the UK, then there are places and people that can help you escape that hellhole.
I really can relate to what you are saying. I have grown up knowing I am not good enough, and it is such a horrendous feeling, knowing that whatever you do, however hard you try, you are never good enough. But it is important that you realise that you are important, you are a special person, and most likely, once you leave that place, your confidence and self esteem will grow and improve.
Killing yourself let's the abusers win, and that's not right. They deserve to lose, and the best way for them to lose is for you to show them that all they have put you through has not stopped you from being a brilliant, successful, caring, loving person.
It is hard, but try to keep fighting, even if it is just so that they don't win.
Like I said, my PM box is open if you want to chat