All of a sudden common sense is no longer common!
Of the little science I know, every cell you have (your hair cells, skin cells etc etc)  has your genetic make up XX (female) or XY (male) "stamped" on it the moment you were conceived, months before your birth. 
Changing your external genitalia does not change this. 
Change the  exterior color of your house and expect the interior of your house to magically transform. 
You do not really have a choice here, it was determined before you were born! Laws and wishful thinking, no matter how sentimental, cannot change genetics.
People who are truly and really genetically transgender are RARE, very RARE.