I'm sorry. TL;DR.
What I got from this is that it was an enjoyable kiss.
Well, I'm a girl, but if I had an enjoyable kiss with another girl, I don't think that would mean I'm a lesbian right away. That just means they're a great kisser. If I'm understanding the problem correctly, just be cool. As others have said, it doesn't have to change you if you don't want to. Although it seems very likely you're at least bisexual.
I should note to you this is coming from a fourteen-year-old girl who's never kissed any other human being*, let alone gone on a date with one.
*One could say my cat stole my first kiss, but I'm pretty sure Noche didn't understand the concept of kissing.
On a related note:
http://www.southparkstudios.com/clips/155511/contraband-found