Omg!!! Please help me!!!!!!!!!!!!!!!!!?

Ok I have this friend....I didnt know she was a lesbian until today..and the story is like this, my friend called me and said she liked me and I threw up some Perfectly good Oreos!! then he hooked us up and now I have to go out with her...ALONE!! this weekend!!! I used to like girls but that was 4 years ago!! What should I do!!!