A number of highly talented actors and other artists feel insecure about their talents at times. Emily Mortimer once said “I’m probably far too self-conscious to be an actress.”
Psychologist Mihaela Ivan Holtz notes as a creative person you can "feel confused, unsure, and may even doubt your talents and skills." One issue: "Your unconscious mind can sabotage your dreams."
See much more in article "Are you unconsciously holding back your creative career?"