as in the words of mr jean eugen roberts (who i hope doesn't mind me saying this) "realise that it isn't the end of the world". He did a performance the other day at a moments notice on stage whereby every other magician there refused to do it because they were unprepared. Everything went wrong from start to finish...but he learned from it! And he is still performing!
And an important part of this story that you left out, was that it was still FUN. I failed completely and utterly and loved every damn minute. Eshly I think you should know, that while my close up magic is the best in the world, my stage magic is the worst ever (even worse than Chris).
The reason for this is that while I have over ten years of close up experience I have exactly zero years of stage experience, and the only way I'll ever get any is if I perform in front of an audience and suck. You mentioned you watched a mentalist perform who was awful, thats a good thing it shows you how c*** (not the best) you can be and get away with it.