I discovered my girlfriend is a !?

Im a straight male. Ive been dating my girlfriend Cindy for 2 months now and she is very beautiful. The first time we had was last nite. Im feeling on her crouch and all of a sudden I pull a 5 inch from her panties. I was in total shock what do I do?She told me she loved me and this doesnt change things that she is a woman. Have I fallen for a man? Should I continue to date her?.Im confused. She is very beautiful and surprisingly to me her looked kind of y on her body. Am I gay if I date her?