My OCD is ruining my relationship

I live in my boyfriend's parents house ever since I found out that I am pregnant. In this house the mother has asked me to get an abortion and the dad keeps telling me that I'm obese(even though I am not). His parents have a business in another state so they are not here at the moment. My bf brother brings over his friends all the time and I don't feel comfortable living here. I stay in his room all day. I clean the room and wash his clothes and do stuff for him. If the kitchen wasn't so dirty, I would cook a lot more. The house is always a mess and my OCD(hand washing) and germaphobic problems are making me fight with my bf. Sometimes he understand but the majority of the time he says that I am a mean person. I do get mad over stupid things like him not closing the door or leaving things in a certain place bc he forgets a lot. Today he told me that I am just a horrible person because I bitch at him every time he gets home from work (which is not true) because I know I try to not get mad. He told me he's tired of me just "yelling" at him for stupid stuff and that I need to change. I agree I need to change but I feel like the situation here at his house is not helping me. I still love him but my OCD is too much for me sometimes and how his family is fake is just annoying. Help.