In my late teens my porn and my fantasies were mostly straight

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In my late teens my porn and my fantasies were mostly straight and occasionally gay. I only fell in love with and obsessed over the girls I knew in school. I didn't feel the need to act on the gay urges I sometimes had. Perhaps I was afraid to, but I felt fine identifying as straight for the sake of simplicity.

In my early twenties I thought I'd already peaked sexually. I still thought girls were pretty, but my urge for sex seemed diminished. I didn't even jerk off that often anymore. I got somewhat depressed and felt that everything was monotonous and bland. During this period, I somehow still managed to get a girlfriend, but that didn't help.

I'ts been a couple of years now and I'm in my mid twenties. I just realized that my porn has shifted from mostly straight to mostly gay. I occasionally think about men to stay 100% during the few occasions I'm intimate with my girlfriend. I find her extremely pretty, and she's just what I used to consider my type, but it still feels strange.

A few months ago, I even made the mistake of cheating on her. I chatted with some guy on grindr and got so horny it felt like I had an aggressive fever or something. I hadn't felt that sort of sexual urge since my teens. I met up with the guy and sucked his cock. Just having him in my mouth for a minute made me twitch as if I was about to cum. I didn't even have to touch myself.

What's happening? How do I get off this train? Can you change your sexuality after all? My libido has returned to me completely now, but it's pretty close to full-blown gay. I sometimes try to force myself to watch straight porn, but can't help but self-insert as the girl. Help.