I am having the same problem .and I am freaking .out like I cant describe what I am feeling because when I am not having the thoughts that I am a lesbian  I will not feel that I am attracted to a girl but when I am having them it doesnt have any science cause I know that I dont like girls it is like there is a lesbian in my head that makes me think like that. I am freaking out and I really really need help it is so confusing and frustrating.