Being a good girl did not work for Lilly Ledbetter. It will not work for you.

If your boss believes that your superpower includes 1) doing A+ work, and 2) having no needs — being serene in your knowledge that, however unfair it may be that you earn 75% of what the guy next to you takes in, everything will come out in the wash eventually — then of course you’re going to be hesitant about approaching him for more money. His good opinion of you is tied to his assumption that you are non-threatening.