How can I prove to my parents that Im old enough to be on my own?

Im 20 yrs old, still leaving with my parents and they treat me like a little girl. I have a curfew (midnight) and as far as I know, they dont want me to have a boyfriend. Im allowed to go out with friends about once a week. Even if I go out in the afternoon to watch a movie or hang out at Starbucks, I still have a curfew. It is frustratin bec I follow their rules and yet they still dont want to loosen up, even just a little bit. If I rebel, I know that they'll be stricter than ever. I tried talking to them about it and my mom blew her top off. To them opening up the topic of being less strict is a way of rebelling. HEEEELLLLLPPPP. :(