Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
Put your insecurities away and get on with achieving your goals. Reflect and remind yourself that an accurate criticism is the most valuable feedback you can receive. Imagine how silly and unproductive it would be to respond to your ski instructor as if he were blaming you when he told you that you fell because you didn't shift your weight properly. It's no different if a supervisor points out a flaw in your work process. Fix it and move on.