If anyone has watched Demon Slayer there is a character called Zenitsu. I feel like this character accurately how I feel sometimes.
Zenitsu is constantly questioning himself, his thoughts, his feelings, and actions. See the video below for some funny examples.
When he's in a really dangerous situation he becomes overwhelmed and passes out. But he wakes back up in a semi-conscious state removing all of the doubt, revealing the true warrior within himself.
It turns out he's one of the strongest characters in the anime. If you are comfortable with animated violence I would highly recommend watching this scene where we first see his true power.
Nobody originally thought that would be the case given how he would behave in normal situations.
Zenitsu resonates with me a lot, I feel that past all the anxiety, self-criticism and self-judgement is an amazing individual. All I need is the tools to help bring that side of myself out.