Just considering, even for a second, the mistake you made as a good thing can be enough to stop the fight-or-flight response in its tracks. Because the brain’s first reaction to new concepts is to accept them as valid, in the extra second it takes disbelief to arise, you will already have moved on with renewed confidence. You can tell yourself, for instance, that business moguls and entertainers make mistakes purposefully to make themselves more relatable to the audience.