I hope that the only standard that you judge yourself by is your own and not society's. It is possible for you to be a success if you establish your own personal groundrules.

Were you nice to someone recently who didn't deserve it? Then you were behaving in a worthwhile manner. That was a SUCCESSFUL act. You are achieving numerous little things all the time that demonstrate your value as a decent human being and I hope you will start awarding yourself the credit that you are due.