Boy this brings back memories I haven't actually processed yet. It didn't seem all the bad in the whole scheme of things until I read this posting.
I am going to agree with Scout and say that your mother is 'crazy'. AKA - what she does is not reasonable, her actions can't be anticipated, hateful, irresponsible, abusive and highly dangerous. I think it is important that you see the highly dangerous part. Scalding with boiling water? Knife pointed at your eyes?
You father (sorry) ought to be shot and hung in the village square for allowing this to happen to his daughter right.in.front.of.him. I don't care if he doesn't want to be around her or not.
So, my teenage life was like this as well. I escaped (yes, I said escaped), because a woman friend offered me a spare apartment for me to move into. My mother cried and carried on because 'she didn't want this to happen, as I was too young'. Seriously? I was too young for any of the behaviour that was happening in my house because of her. Free rent or not..... there is no excuse for what she is doing to you physically and psychologically.
Let me be clear. There is nothing you are ever going to be able to say or do to stop your mother's behaviour. Somehow you need to get out.
I expect that the mother of your friend has a good idea of what is happening to you. Is there something stopping you from having a discussion with her as to the possibility of living with their family? I know you aren't used to it, but some people are just damned nice and want to help people in your situation. She most likely will not have the expectations of you that your mother does and that may take some getting used to. Perhaps it is you that is thinking this through too much because of the way you have been brainwashed into believing that you must have tremendous value in the house that you live in.
I would speak to your T about moving out only. If she is not receptive then I suggest that you find either another T or a woman's outreach faciliity and see if they can counsel you in escaping. They are experts at that. They can tell you what you have for resources, help you keep yourself safe in your house while you are still there, help you to understand the conflict that you have (that you are killing your mother, that you can't leave,) and they can also help you keep yourself safe from being stalked. Outreach programs don't usually go through the bull crap of delving into past traumas and will believe what you are saying. It sounds like this T you have currently is having a hard time getting her head around what is happening and that isn't a good thing for you right now.
I strongly suggest that you not deal with past trauma stuff right now. You need to get safe first.
My heart breaks for you. And I believe you.