Yeah, I get what Bill is saying about Superman, but I think Bill gets the mythology a bit wrong. "Superman" is also a front and a costume, just like Clark Kent is. He's really Kal-el.
That, however, is pedantic. The bigger problem with the metaphor is that Superman is an alien growing up in Earth culture (so far so good), but when he comes out as his "true self" he doesn't have his true culture to transition to, and so he ultimately stands alone. Michael Valentine (A Stranger in a Strange Land) might be more apt, but that book is problematic as all get out.
All that said, I think I get what you're getting at. We have to embrace the fact that we really were always female, and integrate that into our understanding of ourselves... and hence how we live in the world... yes?