Having blue eyes is a mutation, so should people with blue eyes be called mutants too? Its literally a birth deformity. I have no idea why you find offense in that.
So if gender relies on only your conscience, does that mean you can literally think of something hard enough until it becomes a physical thing?
As I've said, gender is how you act, look, talk, think, etcetera. Not anatomy, loveual organs etc. What you're born as does have a huge influence on this, but it's not a direct implication. Thinking and a decent wardrobe can change all that, yes.