Only when you feel strong and hold a responsibility for your own actions, decisions, and failures. Believe that you are amongst those beautiful creations on earth who are torn by the forces of nature or life, but you stand up and grow again. Failures are nothing but a form of outcome. You tried and then only you failed. You are far better than those who never tried.
Believe that you are constantly rejuvenating yourself every day and learning. And just relax!