Virgin blues

I'm 16 years old and the guy I'm talking to is 17. We've been talking since summer and we've been on a lot of dates but he says that he usually doesn't date until he's talked to a person for a while. He wants to take me after school tomorrow to his house because he will be home alone, and he tells me I don't have to do anything if I don't want to, but I know once things get going I won't be thinking clearly. I know I'm ready to do stuff but there's something in my mind it's a little scared now that it's becoming real. Will somebody please talk to me and tell me what they think?