I know that it is hard growing up. I remember how it was when I was your age and felt as an adult but no one would accept me as an adult.
I also rememember coming out. Fortunately for me I lived in a primarily gay/lesbian neighborhood at that time.
My advice to you is to get involved with lesbian groups on campus The kinship you will have with these groups will help a lot.
I don't really know what to say about your parents. I know that when I came out to them it was frustrating. I know that eventually they accepted my sexual orientation. My advice as far as your parents go, I guess would be for you to live your own life and try not to be too concerned about their approval or disapproval. Yes, I know that that would be very hard. But I do have to tell you that being a sexual minority is very, very hard at times and the main thing is to have the support of other like minded people.