Need some advice for bi college boy?

I'm a 19 year old male and I think I may be biual. I want to express who I am and I want to feel comfortable in my own skin but I have some social problems with friends. You see, I'm in college and college is supposed to be a time for reinvention, a time when you start to feel comfortable in your own skin. But for me this is going to be difficult. I have a friend here, a girl, who I have had a pseudo-relationship with for awhile now (she went to my high school). She goes to my college and I basically see her every waking moment. I just don't know what to do, I couldn't bare losing her more than anyone else. I love her very much. Any suggestions?