Predate nerves. Help!?

I'm 17 years old and going out on my first date ever with a guy who really likes me. I'm not sure if I like him though, but I figure that it's just a date and if I don't like him when it's over, I can tell him that. When he asked me out I was pretty happy because finally a guy liked me, but now I'm terrified and I feel sick whenever anyone talks about him. I don't want to tell my friends about him because I'm afraid of what they would think and I just feel smothered by how much he likes me. I really don't want to go on the date, but I feel like I'd regret it if I don't go. Are these feelings normal or what? Help!