I've never felt like that , I've always known I was a charming fucker .
Believe me when I tell you if you don't see good in you how is anyone else going to.
Work is needed on your confidence and when you feel better about yourself you will project that to the opposite sex . Confident men have more success with women because they have self worth. Start counting what you can do instead of concentrating on what you can't, try new things and don't worry about success or failure.
You will discover your strengths if you stop inspecting your weaknesses.