So confused..

This guy I just recently started talking to is trying to get me to have sex with him, but I'm a virgin. I'm not a virgin cause I'm saving myself or anything, I'm a virgin cause I've never felt like I was ready to lose it. My biggest fear is being a one night stand, that the main reason I'm still a virgin. He tried to used the excuse I was almost 18 and he didn't get the big deal, but it's not an age thing either. I want to give him what he wants, but I don't wanna regret it later.. I want to be sure about it.. I just don't know what to do in this situation