I really thing I am gay but I'm so confused!!!!

Hi guys, I'm a 22 year old guy from Massachusetts and I've struggled with my sexuality for over 6 years. I used to post pictures of myself naked on Craigslist looking to talk dirty with guys, but I never actually kissed or had any sexual relations with them. I sometimes glance at a girls butt and it make me feel a little turned on but barely. I don't care about dating at all, like no interest in sex or relationships with any girl.So I made a little test, I watched porn with girls for 5 minutes and no erection, then 30 seconds into gay porn I became instantly aroused. On top of all of this I have terrible anxiety so I can't even explore my sexuality.Also I'm really only ever attracted to much older men or people who I know are gay.I think I might be gay. What do I do now?