I was fourteen. I felt silly and childish and embarrassed that it was my first kiss. I didn't want him to know. Of course he did, because I was fourteen and I didn't know what I was doing. Incidentally this is also the way I felt about losing my virginity.
After the initial first-kiss awkwardness, it ended up working out okay.
I think this may have been my only non-intoxicated first kiss. Not sure what that says about me.