It could be
That you’ve didn’t practice enough
That you didn’t have a standing ovation
That your expectations are unrealistically high
That expectations was unclear
That you’re trying to be everything to everyone
Consider the oldest and most successful book. Even the bible has one star reviews, who do you think you are?
Chances are, it’s not about societal expectation of you. It’s a trap to try and win that game. It comes down to your inner expectation of yourself.
It is first to look within and figure out those expectations, to see if they are realistic and if it is what you wanted in the first place. Perhaps when you solidify your own standard, the courage will come easier.
Sometimes, the most important job is an inside job.