The things we say to ourselves influence our feelings and our attitude. Once, there were two shoe salesmen sent to a faraway land to sell shoes. The other salesperson also sent a telegram. Many people beat themselves up when things go awry. When you berate yourself and tell yourself that you are 'stupid' or 'useless' or 'an idiot', naturally you begin to feel negative about yourself, your business, the people around you and even life itself.
Mistakes are the fuel of creativity.
Everyone makes mistakes. Try positive affirmations in place of negative self talk. Successful entrepreneurs keep their positive attitude by being careful about who they hang out with. There are always others who will readily tell you that 'it can t be done' and ' you ll never make it'. Surround yourself with supporters.