selected fiction.

Doll had learned something during the past six months of his life. Chiefly what he had learned was that everybody lived by a selected fiction. Nobody was really what he pretended to be. It was as if everybody made up a fiction story about himself, and then he just pretended to everybody that that was what he was. And everybody believed him, or at least accepted his fiction story.

...

It was strange, but it was as if when you were honest and admitted you didn't know what you really were, or even if you were anything at all, then nobody liked you and you made everybody uncomfortable and they didn't want to be around you. But when you made up your fiction story about yourself and what a great guy you were, and then pretended that that was really you, everybody accepted it and believed you.