Could you re-account any experiences you had where you've created a reality from stories you told yourself?
On a small scale level, I've helped myself get over a cold by pretending that my symptoms were evidence of allergies and not an actual cold. By changing my mind about how long it would take me to start feeling better, I think I was able to talk myself into a quick recovery.
This is a fairly common occurrence informing a self-image. A person can exaggerate his or her success, adumbrating failures, and constructing a fantasy life made of these pats. A professor may recall a lecture he gave that was "brilliant" while forgetting the many dull or unprepared ones, and imagine himself/herself a great teacher, when in fact he/she is dull and immemorable.