It's a delusionary psychosis to believe you are biologically something other than what you are.

The people masquerading as the opposite sex (overwhelmingly, as women) fall into two groups: mere transvestites who know they're pulling a ruse on normal society; and paranoid delusional psychotics suffering from gender dysphoria, actually believing they are the opposite sex and being persecuted for it. This is clearly a mental disorder, one involving an inability to perceive and/or cope with objectively observable, shared reality; and involving a pronounced persecution complex.

We have places for people who are unable to accept reality; are abrasively offensive and/or violently dangerous to normal people in society and/or physically threatening to children; and must live in a secret internal world of their own bizarre sexual delusions. Those places are called mental institutions.