That you have the doubts you do when you've done well is a bit out of my depth; most often, I feel much as Joe does - shame and embarassment when I know I've botched it. For me "it's not the singer, it's the song" and I feel guilty if I didn't get it right. It sure helps if you can forgive yourself if you've slaughtered a song (or a tune) you love and were enthusiastic about sharing. As I've done more singing in public, and made more blunders, a skill I've developed, and reccomend to you to cultivate, is not letting your mistakes or doubts derail you. If you miss one chord/line/chorus, it's better to be able to just keep going than to give up entirely - and fewer people will be aware it happened.

When you've done well, and don't get kudos, especially at a sing around, it seems so many folks tend to be thinking mostly of themselves and what they're going to do next. It is very likely that no one is going to be half so critical of your performance as you yourself are.

Sing because you have to sing. Sing with others because you need to share. Save your self critiques for when you're practicing. Find some musical friends you can trust to give you the feedback you crave.

Keep on keeping on, please.

Joanne in Cleveland (not the best player in town, just the best in my house)