I'm a little confused. I am 19 but a little immature for my age. I'm not sure if I like girls or boys. I think I may be bisexual. I haven't exactly had a serious relationship with a boy before. I have fantasied about making love with both sexes. I know its normal to have a "crush" on someone of the same sex but is it normal to want to be with them?
I quite like my friend, who is a lesbian, and was upset when she told me she had a girlfriend. A few months ago I split up with a boy. Although I didn't sleep with him I did let him touch me. I was with him for about four months but wasn't really upset when we split, I was more upset when my friend told me she had a girlfriend. I feel attracted to both sexes equally and really liked my female friend.
Iis it normal to feel this way or am I bi? Do I just need a little more experience?

For sure you are confused, but be patient, as you learn and grow, and the confusion will be lifted. Until you are more experienced, you will be confused. That's normal for everyone.

If the friend you like who is a girl is definitely lesbian then there is no way you can be with her.
You need to start getting over her before it really starts to bring you down, because you will most likely be able tell how you truly feel about girls and boys through experience. And you won't be getting any experience for that girl if she has a girlfriends of her own.