Andy, I've been thinking about your first post, how you said that one night your chords were perfect, etc, and nobody said anything.

?But would it really make you feel good if somebody said, "Nice job, Andy, no mistakes this time. And your voice didn't let you down!"

I'm pretty sure it wouldn't make you feel good. Therefore I think you should let YOURSELF praise yourself when a song goes especially well, quietly building your own confidence.