It's what's in your heart that counts the most. Some of the best applause I ever got was when I attempted, very badly (because I had not practiced it in awhile), to play a tune that someone requested at a small event. But I was game, and we kept going in spite of me, and got all the way through. I realized then that an audience appreciates a good sport as much as a good performer.

Also I know that I am very hard on myself, and often critical when I don't need to be. I have to remind myself that most of my audience is not going to be musicians or scholars, but people who enjoy listening. I'm sure the folks you played for appreciated your efforts very, very much. :)