disowned from my family

Recently my step mother has been very open about how she feels about my boyfriend. She has kicked me out of the house in Christmas cause I am in a relationship with this man who makes me so happy. I've tried over and over again how I feel about him. She told me tonight that if I marry him (which I'm planning on to) then I can say goodbye to this family and I won't be welcome anymore. My boyfriend is an amazing man with his life well put together. She doesn't like him cause he isn't attending college. She has never like any of my friends throughout high school and I wasn't allowed to date until I was 18 so I never brought boys home until him. I have tried fitting into this mold she has made of me but ever since I started dating she has treated me like I'm this horrible person. I have done everything in my power to prove to her that I'm not. Since all this has started happening my dad has taken her side on everything and has turned his back on me.