I am my own biggest critic. I probably edit a piece of creative work more than I should and just when I'm done, I realize, Nope, I can't possibly be done, "That line just isn’t good enough", "That expression fails to communicate", I'd rumple my electronic sheet of paper and start all over. I continue to poke and cringe at it for ages even after it's published.

Everyone who has ever created or invented something-no matter how minute- has probably felt this feeling of creation-criticism on some level...