Nerves.

I might be a little nervous to be in charge of editing a weekly school television show.
I might be a little nervous about the possibility of a girl liking me.
I might be a little nervous about buying my new frames.
I might be a little nervous that I am totally wrong about everything while I think that I am totally right.
I might be a little nervous that I won't live up to the expectations of everyone.
Mostly, I am nervous that I won't succeed.

"The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark."
Michelangelo

Well I doubt I'm aiming too low. That is what makes me nervous.