you are pretty and not because of your big boobs, they merely help your fabulous curvy figure

on the feminine clothing front you can either find skirts and pretty blouses you feel comfortable in or make a decision in your head that its not dressing up and stick to it, the first of these options is argubly easier though.

Maybe on the deportment front if you could find the time doing something like some sort of dance class might help as it might you more aware of how you hold yourself