Living with mother,paying rent, not allowed to have a key and cannot have my fiance come over, what to do?

I love at home with my mother because I lost my job and cannot live out on my own because I cannot afford rent as it is for a single studio apt. I am paying to live at home with my mother and four brothers. My mother is refusing to give me a key to the house and says that I cannot have my fiance over because my brothers and her do not like her. I have asked several times to have her come over and they refuse. I have also asked several times to get a copy of the key so that if I go out I can get in without having to sit outside and ring the doorbell untill someone gets the door. I have called the Oregon Bar and they say it falls under a landlord tenent thing and I called some organization about it and my mother refuses to accept the legal side of it and says she talked to a lawer and since it is not an apt that it does not matter. They say it does but since I dont have the money to get legal mediation, I cannot go any further. What should I do?