How should I approach this?

So. I'm 20, student. I met an Erasmus exchange student yesterday, I know he's gay and he knows I'm gay and I like him and he might like me back. Not sure, it's still way too early to tell. :P But, he's this type of guy that's totally laid-back, he drinks tons, he does a few types of drugs and he likes noisy parties. He likes to do ridiculous stuff just for the hell of it. And I'm the exact opposite of that. :PI can accept him being more extroverted, drinking a lot and even doing drugs, but my biggest inhibition that stops me from flirting with him is sex. I'm generally a cool and dominant personality but when it comes to sex, I'm still extremely shy.I've only been with one guy (my ex) and... it wasn't great. He was having a good time but I wasn't, and the thing is, he was trying really hard to make me relax about it. So I feel kinda embarrased to flirt with this guy, now, because if he likes me, it is definitely going to go towards sex way too fast. Not that going more slowly would help, to be honest.And, before anyone asks, no, I'm not asexual. I do have a sex drive and it's actually quite potent, I'm just scared to relax and get intimate with a person. And also, I'm perfectly happy with being gay, so it's not that that's holding me back either.I'm kinda scared that, if we are to get intimate, either I won't be satisfied and it'll be an ordeal instead of a pleasure, or I'll try to do, hm, stuff that I like, and he'll get turned off because for some reason I assume he's more vanilla.I'm sure things are not as bad as they seem, but still, I cannot make myself chill out and just let it happen. Not just with him, but in general.Every time I'm getting intimate with a guy and we start moving downwards, I just become really self-conscious and tense, to the point where I practically turn myself off because I go ballistic internally. I wish I could just relax, and also have the courage to experiment more without being so worried that I'll be judged or turn the other guy off.So, has anyone else here had similar issues?How did you deal with it? Did it get better over time?