Many high performers are running two jobs: the role itself, and the performance of certainty that the role seems to demand. The second job is invisible, unpaid, and exhausting.
Performed confidence has a tell: it needs constant maintenance. Real confidence is quieter. It does not need to be projected because it is not covering for anything.
The gap between the two is not closed by better acting. It closes when the private self-image catches up with the public one, and that is identity-level work.