I started thinking I was a lesbian

Ok so ever since I was little I was attracted to boys and never girls, I loved boys and was obsessed with a guy for about 3 years! But about six months ago I was masturbating and I usually only think of how good it feels never a gener boy or girl and then for some reason I pictured ago and got off straight away. I then panicked and started thinking I was a lesbian, ever since then I've lost all my attraction to boys, I seem to be attracted to girls now. Whenever I masturbate I can only ever get off to girls. I don't like it though ? I mean I don't want to be like that, I want to get off to thinking of boys, and I want to be attracted to boys etc. I also kissed a boy the other day and I got aroused? And I used to think before all of this think he was so attractive now I think nothing? I think that about all of the boys, and I think girls a beautiful which they are but I never really notice them until now. I want to masturbate to thinking of boys but for some reason girls turn me on? How can I get out of this and get my attraction back to boys again, I really hate this.