The OP did not say ALL confidence comes from dick size. He asked if some men have MORE confidence because of being hung. This is no less natural than having confidence because of a strong physique or a handsome face. They make the process a little easier. Some of the posts here, in my opinion, were unfair and did not speak to his intent.
To assert that all confidence comes solely from inner qualities is unrealistic. Yes, character and personality are absolutely important. A handsome, strong, big dick guy will lose his partner quickly if he is a total jerk. Nevertheless, a short, fat, small dick guy will probably struggle with dating beautiful ladies, no matter his character and personality. This is simple reality. Let's not moralize too much.