Sorta confused, is it just hormones?

Hi, this is my first post, please tell me if I missed something

So I have been feeling like I'm gay, but I'm not interested about having a relationship. I'm 17, and I go to college in England. I watch porn on a regular basis, but I always seem to watch gay porn more than straight.

I would love to get a girlfriend, but I would not have a romantic relationship with a guy, I would just be open to sex with them (I thought about this for weeks). I found a term "heteroflexible" which I feel like I identify with: I would have sex with a guy, but I wouldn't actually go out with a guy.

There is a kind-of exception though. I have a massive "crush" on my straight friend. He is just under 7 months older than me, and we are in the same year. He's really hot, and everyone who knows him can see that he is a very sexualised person. He has had numerous girlfriends in the past, although he hasn't actually done anything yet.

Anyway, I've had these really intense sex dreams about him. I don't want to go too much into that, but those dreams have kind of come from me thinking about him a lot. I'm able to control myself in his presence, but I keep having quite scary fantasies about him.

Last December, we both got drunk at a party (I was more drunk than him actually, he was pretty much sober, if not tipsy). At one point during the night, I had my arm around him, and he started licking my arm. He then commented on how I would not let him do this if I was sober (which was true) and we both jus kept feeling each other, to the laughter of our friends.

I told him I was heteroflexible, and I've dropped subtle hints to him and my friends about how I feel about him, but they think I'm joking. We have this ongoing joke between us.

The thing is, I would not really want to have a proper relationship with him. He's a good friend, one of my two best friends, the other of which I've told about my sexuality. I just really want to have sex with him. Is that even normal?

I guess what I'm trying to ask is, what should I do? Is it too early to tell my actual orientation? I heard that hormones are going crazy in the teenage years, so is that why I feel like I really want to fuck with my friend? It's not just him, I've have fantasies about a lot of men and a few girls that I definitely like, but he's the one that's most appealing to me at the moment.

Oh, also I feel like I may have messed up with this friend during high school. He kept making advances on me (friendly banter, not sexual) and I kind of just kept rejecting him. He still does it to me now, although WAAAYYY less often now. Also, it's become clear to my friends tht I would do absolutely anything for him, much to the the point where they started calling me "his bitch". I would do anything for anyone really, but for him I would really just get up and do it without question. Well, withing reason, obviously.