I've been recorded in a studio playing guitar and singing on separate tracks (not together in real time, but separately), instead of at the same time as you do live, which I always find difficult to get used to. But the end results seem to sound OK to other people, even though when you listen to it yourself, you probably notice any slight imperfections, or think "I could do that better if I had another crack at it".

I think you just have to accept it, that any recording is a snapshot and not necessarily the best you've ever done. Every now and then, a live performance you do seems to you the best ever, and you wish it had been recorded. But if it had been, the chances are you would listen to it and find something wrong.

Best not to worry about it, as others have said, and just enjoy doing it all - recording, singing/playing live, the applause and the craic :-)