Is it normal to be terrified whenever a guy shows interest in me?

Well, there's a guy that I've been going to school with for four years and he has told me that he likes me and the usual stuff like that, and we've kissed a couple of times. And he keeps asking me to go out with him too. But I get this really weird feeling because I like him but I feel as though I want to cry and hide away from the world because, at the same time, I don't want to see him. I'm pretty shy and I'm used to being alone a lot, and I know that dating is very far out of my comfort zone. Recently I've been wondering if there's something wrong with me because I get so scared when I think about the prospect of going out with him on a date, or getting close to him. And I told my mom, and she was just curious about him, but now I feel very awkward whenever I'm around her too and I'm so scared she'll tell my dad and my family. I don't know why I'm so terrified. Is there something wrong with me?