The best confidence comes from knowing you can recover from mistakes.

Confidence built on not making mistakes is fragile, since the first error takes it all. Confidence built on knowing you can repair things survives everything, because it does not depend on a clean record. That version is available to anyone who has recovered from something.

Instead of trying to avoid errors, build your ability to catch and fix them. Notice the times you recovered. That record is a much steadier foundation than an unbroken run.