I totally have a lesbian crush on Sarah Michelle Gellar!
But anyway, I don't know, I'm kind of in your situation. I always considered myself straight, until I started having secret crushes on other females. So, I thought, hmm... am I bi-curious or bisexual?
I kissed my best friend, when we were drunk, and it wasn't bad at all. Girls' lips are softer than males, but that probably goes without saying. I do think you'd have to be attracted to the person, to willing want to make out with them, though.
I think you're bisexual, however.