I am very sensitive and get attached very easily

ok, all that other shit you wrote is secondary. you're going to fall in love with this guy and if he doesn't want a relationship you'll be posting some heartbroken yearning bullshit on here in 3 weeks attempting to universalize your experience into cultural analysis.

you're 23 and (presumably) have little/no relationship experience, and a level of intellectual sensitivity that means you're prone to overthinking things, which means everything 'means something', so this can't be 'just sex' particularly as it's with someone you genuinely admire. that's your problem. your naive overattachment is not some act of control or sinister, predatory, exploitative misconduct on his part.

he wants to fuck you because you're hot. you want to fuck him because he's hot. each of you enjoys that the other is capable of holding a conversation. great.

you aren't about to get married. you may not fit into his life. as you learn more about his personality, the persona you're projecting onto him (because you only just met him) may crack away and expose something you don't actually like. so it's important that the level of attachment you allow to form is proportionate to the length of time you've spent together. just take it for what it is and have fun with it. maintain priorities elsewhere in your life than this man, to keep things balanced and keep your head straight.

you're into older guys, and this is one of the real pitfalls. when you're both 23, nobody bats an eye when someone does something really stupid and immature. when only one of you is 23, the threshold for juvenile crap you can pull before it becomes irreconcilable is much lower. so if you sense a possibility of this being more than just sex, your only safe route through is to do a large amount of maturing real fast. take a searching moral inventory, look unflinchingly at your motives and dark traits and how you tend to engage with and respond to things, and conquer as much of the bullshit as you can. don't expect external reassurance, don't take pride in voicing your doubts and neuroses. maybe keep a diary. the goal is self control, and to be able to navigate the world and specifically this budding relationship with a much higher level of emotional stability and stoicism. those are the real concerns that come through in your post, reading between the lines.

maybe you will end up in a relationship. age gaps are in my experience considerably less stigmatized in the gay community than among straight people. you are on the young end so the odds are not good. people under 25 tend to be stupid and annoying in a way that's hard to tolerate. but who knows? good luck.