The thing that holds me back the most is my self confidence

All it means is that you strive to be perfect. In my eyes, you're already there

I know... But I should have done the improv and I should have played that solo in the bows music and I should just be confident and play correctly

You still have a super good chance at all County. You have a million more chances to play dirty in the bows music. You play correctly, and you sound confident and like you know what you're doing