Well, the first thing to do would be to stop caring what “Women are expected to be.” Doesn’t matter whether you’re male or female, attractive or not, letting other people’s expectations factor into your own self-acceptance is a recipe for unhappiness. If you work on not caring, then you will will be more attractive because confidence is an attractive quality. It’s actually rarer than real attractiveness, so boys can get turned on even more by that than a flat stomach and nice tits.
Also, you don’t need to be attractive to all boys. Just one boy, the one you marry.