Just read the whole of the thread and I'm sorry to hear you have had such a hard time but you are making the right steps.
I can understand why you don't want to tell your parents but not sure you see the big picture (sorry if I have this wrong).
You say your parents love you and would be mad that they didn't know this was happening but if you go to womens aid or take a council house in a bad area they will want to know why you did this (especially the womens aid). I would have thought you're right and they would be mad at you but only because they love you and once you have spoken to them they can help you get through this. If you send them an email they will only want to see you and you will still have to discuss it with them face to face. Get it over with is my opinion and then they can support you as you know they will :-)
I hope everything does go well for you (it can't be worse than what you have been putting up with) but if there are problems along the way it would be good to get the support of your folks.