How can an adult live under their parents' rules?

I am a 22 year old college student going into my “super-senior” year. I moved home about 2 months ago for coneviences since my work relocated as well as family matters since my father’s job is only a contract job that is up at the end of the summer. I have been in a relationship with my loving boyfriend for a little of a yr and known him longer than that. Anyways, my father likes my bf very much and my mother on the other hand can not stand him. In all my life, I have never had a curfew, never had an allowance, I can home when I pleased and that was fine. I never caused any trouble, and I have always been a good child (no drugs, never been arrested..) nothing. However, since I moved home, my mother will tell me when I go out be home by 11pm. Now what mother tells their grown adult child to be home at 11pm? Seriously, I have my own car, my own license and my own job. I support myself and am saving up money. When I don’t obey(and trust me, I dont becuase I think this is absurd) she will yell at me. Also, she GOES THROUGH MY mail and looks at my credit card and checkcard purchases and questions EVERYTHING! I am independent and I will spend money on stuff once in a while. However, since my parents pay for my college education and believe they should have every right to make choices for me (i.e. when to be home, what hours I should work, how many hours I should work, know what I am doing at all times). My mother has actually called my cell phone every minute on the minute after midnight until I shut my phone off. When I returned home I got yelled at like I was 13 years old. I am not even allowed to sleep over my bf’s place! And I have..when I returned home I got yelled at about that too. I am the youngest child of 2 and my sister went to Europe with her bf when she was my age, so why can’t I move a town away to my own apartment with my bf to regain sanity? I have the finances, and we know this will work between the two of us. My mother has gotten between us far too long and this behavior is not being tolerated by my bf or I at all.

I need advice on what to do. I know I want to move out, however, I fear my education being thrown at me. I just don’t exactly know how to go about to break this to them that I am going to do this and they can’t stop me. I have tried to talk to my mother and she won’t listen to me. She will just tell me I am not moving out and that is final. How is this final when I can make my own decisions? I do not know.

PLEASE HELP ME!! Suggestions, Ideas, comments, anything..

Thank you!