I know those kind of people, I believe it's how you grow up, but I can only guess what it is. Mostly it seems to me they have little self worth or trust. And I wouldn't trade my life or stand in their shoes. I like making mistakes, well not like, but I remind myself that I can make mistakes before I start something. At the same time I remind myself with my own saying: It has always, in the end, turned out good. So in the great scheme of things nothing is insurmountable. (I hope insurmountable is the good word) This gives me a relaxed feeling, confidence, and the joy of finding things out for myself by trial en error. By which you learn an enormous amount and try everything. Nothing is to crazy to do myself. I try to help other too find this too and not restrict themselves but you can not help others that much and people who live in the straight jacket of being right all the time are mostly not helpable, they will hide.