Do I sounds like a lesbian?

Ok so i only ever think about relationships with chicks, i think a relationship with a guy would be weird. All guys i know or are a bit friendly with i feel as friends nothing more, and are not at all sexually attracted to them. i only enjoy watching lesbian porn, i think straight porn is gross. im very selective in who i find attractive, and all of these are women, or very feminine gay men. i ahve had crushes on guys in the past however lately theyve just been female, and have lasted a long time, atleast a year for each. does this sound like i might just be going through a stage, or i am lesbian?