SOS in need of advice. this may be a long one...

soo I recently met a guy who I'm really attracted to. he likes me and I like him, he's really nice, polite, sexy. but I have a tendency to just give it up and have sex with any guy who shows me attention/affection. and so I've never had a real meaningful relationship with a guy. but I really like this one and I was trying to be strong and keep it in my pants, but I lost that battle. now I'm scared that he's going to lose interest, won't wanna hang out, or won't respect me. I know I made this mess myself but it's hard to change the way I see guys. for some reason I think that if I give them what they want then they'll like me. but it's not like that. I just end up feeling empty