I think anyone of any size, shape, color, gender or ability can lack confidence. Maybe it is easier if you're perfect, but the rest of us can fight for it an inch at a time. Do things you're proud of and be sure to give yourself credit for them.

You don't need anyone else's approval. If nothing else, assume a Wonder-Woman pose several times a day and lift your head high and proudly. (Seriously, Wonder-Womaning can lift your self-esteem. Try it!)