OldDude,

You have to get it fixed in your mind that YOU ARE THE GREATEST!!!.

Maybe not the greatest guitar player ever or the greatest voice ever, but you are the greatest at what you do. The audience have come to hear YOU and you are going to WOW them.

You know your act, you can do it blindfold. If you fluff a word or a chord or two, just laugh and say oops! and they will laugh with you.

You offer a performance that they can get nowhere else. Go out and enjoy singing for them.