I agree with Nemo. whatever you are is fine whether its straight, gay or bi shouldn't matter. And if the girl that called you a lesbian was using it as an insult than shame on her, IT'S NOT. It's just kind of sad that her doing so caused you fear and anxiety about what you are. As a lining in the cloud I'm glad that the confrontation sparked fire inside of you. This may be the beginning of a journey of self discovery and whatever it is you find at the other end is perfectly fine. The idea is to live and find whatever makes you happy.