I never have been insecure, because I see what a waste it is. I know there is a solution to insecurity. I don't tend to be thrown by problems that don't have solutions. And insecurity has a wealth of alternatives.
My only requirement for that first story was that there had to be a fight or an explosion on every page. Naturally, no one wanted to publish it, but I liked the character, did a few stories to keep my hand in.
You know, it's sort of common wisdom among New York publishers that short story collections don't make money.