MORE IDEAS FROM THE ARTICLE
When you're second-guessing yourself before communicating with someone, you probably have reservations based on their past reactions.
When you do need to communicate with such people, you may need to tailor your messages to the expectation of how they might react.
If you are convinced your ‘performance’ was a bad and it happens, you can still try to salvage it. A thank you note/email explaining a few things and showing your interest in the job might help change the interviewer’s mind. Botching up the interview does have a side effect: they would remember you!
Providing an honest reason for your bad performance can help, provided it’s not too long and boring. Do keep in mind that this is an effort from your side, and the rest of the factors are out of your control.