Our first kiss

So I just kissed my boyfriend for the first time tonight, and I felt nothing. There was no zip, no zing, not even any firework explosions! Does this mean that I don't like him as much as I think I do?
This was his first kiss (not mine) and I really don't want it to be terrible for him. The kiss wasn't terrible, there just wasn't anything of substance. It kind of felt like I was kissing my best friend. 
What do I do?!