Becoming gay?

First off I'd like to say, I've never had a girlfriend or a boyfriend before. I distinctly remember at around age 12 only being attracted to females, not getting hard from males of anything. As I got older and began masturbating to porn more frequently, I began to became so that when I would not masturbate for a day or two I would want to watch any porn no matter the type. For a while I mostly watched straight porn and watched gay porn maybe once a week. But recently it's become more and mkre frequent to the point where I watch gay nearly every time rather than straight. Am I becoming gay? Could it be that I got tired of straight porn? I don't have anything against gays but I still very much like girls and it makes me depressed when I'm no longer turned on by them. Could it be puberty and a bunch of hormones that's making me confused maybe? I'm currently 16 years old.EDIT: Would like to mention recently I've started to see vaginas as gross looking although I never did before