Performance anxiety can be treated, of course, and there are some well-known actors and singers and speakers who suffer from it. Training helps, there are drugs, notably beta-blockers, and even the folks most comfortable getting up in front of an audience still get butterflies. That edginess can help, if it's not overwhelming.
But big performances make for bigger butterflies ...
I came across this video a year or so back, and wondered how I'd feel in his guy's shoes.
The set up is, there's a busker -- street musician -- in Copenhagen, who was doing some Bruce Springsteen songs, and, all of a moment look who arrives:
Bruce Fucking Springsteen.
Imagine it: You're strumming away doing a Springsteen cover and the Boss Himself steps up.
Heart-attack time. Holy shit!
But, it gets better. Springsteen borrows a guitar and goes into "The River", and there you are, totally unexpected, playing live with Bruce Fucking Springsteen ...
If your head didn't explode from pure joy -- or terror, it would be a memory you'd likely carry with you to your grave.
The notion that I might be playing a song by somebody I love hearing and he or she was in the audience? Playing "Blackbird," and you look down to see Paul McCarthy sitting in the front row, all attentive?
No pressure there ...