I agree be yourself.

Try to feel what you are going to play and sing not think what you are going to do.

Believe in yourself. The crowd will pick up your insecurity. If you believe in yourself and your music the crowd will too.

Don't think about how many are in the crowd or focus on "Is everybody liking it?" Most of the time not everyone is liking it and there is really not much you can do. Focus on making the ones enjoying it enojoy it more maybe the ones not liking it will start.

I don't know man there is more advice but I will take a break. Everyone will have thier own advice and ideas of what is right and wrong. Keep an open mind and read through the posts. Decide which (if any) will help you or you like.

I have read things that I think "No way would that work." Then I have posted things on other threads and people jump me saying "No way that would work." so just keep that in mind while reading. No advice offered by anyone is intentionally bad advice. All is well intended but every performer is different.
cya
JT