In an interview with NPR, former Beatles star Paul McCartney said:

It seems to me that no matter how famous [you are], no matter how accomplished or how many awards you get, you're always still thinking there's somebody out there who's better than you. I'm often reading a magazine and hearing about someone's new record and I think, "Oh, boy, that's gonna be better than me." It's a very common thing.

The interviewer then asked, "But, Sir Paul McCartney: You have had success in so many dimensions of music. You really feel a competitive insecurity with somebody else that's coming out with a record?" McCartney replied: "Unfortunately, yes … I should be able to look at my accolades and go, 'Come on, Paul. That's enough.' But there's still this little voice in the back of my brain that goes, 'No, no, no. You could do better. This person over here is excelling. Try harder!' It still can be a little bit intimidating."