Thinking is a habit, and like any other habit, it can be changed; it just takes effort and repetition.
Overachievers don't think reasonably, sensibly, or rationally.
Superstars think like superstars long before the fans or the press anoint them.
The idea of perfect closes your mind to new standards. When you drive hard toward one ideal, you miss opportunities and paths, not to mention hurting your confidence. Believe in your potential and then go out and explore it; don't limit it.
Exceptional thinkers ignore their critics and go about their business making history.
High achievers dwell on what they do well and spend very little time evaluating themselves and their performances.