Based on what I've read I think you need to focus on your studies...do anything you can to learn and get your license and work hard to get out of that house and on your own. I never expected my sons friends to do any cleaning when they were here. They were guests! Taking everything you've said and this current incident, I think gaining independence should be your primary goal right now. Easier said and done but keep your nose in a book and make it happen. I wish you had a therapist or someone to help. When I was young I used to go to therapy from my doctor/insurance but I also found a local free clinic and that place was more helpful than the paid place. The lady gave me her home phone number and told me that if I'm being abused to call and she would put a stop to it. I believed her and she gave me more hope than the paid professionals with advanced degrees. Perhaps there is a local place with free help for you? I was 16 when I found that help. (((Hugs)))