Have a few questions.. previously(?) straight male 19 yr old

Okay i have some questions to ask. First let me explain my situation.I am 19 in my first year of uni. Before college, I had never had any thoughts about being gay at all. The only thing that ever seemed odd to me was my best friend seemed gay while we took a medium sized dose of acid. I shook that off quickly.In my first year, i've been enjoying the partying life. I don't mean to be cocky but I'm fairly good looking and good with women so I got a lot of attention. However, i've noticed if i take a lot of stimulants, or xanax, or i'm really drunk, I begin to think about other men. Usually oral sex. Sometimes being a top.I've gone as far as making a post on a local site and using grindr to see what I'm interested in. Here's what's weird: i usually am very horny talking to them and then once I see them I'm immediately deflated. I don't know if it's because I like the attention, or if I have some repressed sexuality and I should go see a therapist.To this day the only thing I've done with a guy, when I was on 3mg of xanax, was cheating on my girlfriend and inviting some random similar aged guy suck my dick. I didn't cum and eventually wasn't horny even while he sucked. If that helps great.Thanks for any advice you guys can provide. Mainly looking to see if I should go talk to a professional or if this is common to be into women but still have thoughts.If this is in the wrong place feel free to PM me and ill move it. Thanks /r/gay!