How do I get my roommate to let me live my own life?

I live with my friend and she never lets me have my own life. She always wants to know who I'm talking to on the phone, what about, who I'm texting, where I'm going, who I'm going with, when I'll be back. and when I go out and come back she bombards me with questions about where I've been. I always tell her its none of her business and to stop asking but she keeps on doing it. how can I get her to let me do my own thing at college without ruining our friendship?