How to make oneself look more feminine?

There's not much you could do but exercise. I have big feet as well, and believe me, I hate the size but unfortunately there is nothing you can do about the size of your feet. But you can do something about the rest of your body, exercise. Go for walks, runs, lift weights, etc. Just don't over do it. No girl or woman has a the perfect body. Try to be happy with yourself, eventually it will get better.