Ok so I have a form of Autism called Aspergers and as a result my mid is always taking in information and calculating different situations and what if scenarios about different things. Usually because of the large amount of information my mind takes in I can calculate an accurate outcome for that situation.
Anyway though I don't know exactly when it started but for a long time my mind has trying to calculate the scenario of "What if I was born a girl?" and it has been unable to calculate it. with all the other scenarios were my mind calculates what my life would be like if one aspect change it takes in who I am as a person runs it against the information about the changed aspect based on what I know about similar aspects found in other people. But if I was born a girl the almost everything about me would be different because the situations that made me who I am wouldn't have happened because I would have been placed in different situations based on my gender because the female brain works differently then the male brain. Thus every time my mind tries to calculate it my mind tells me in K-9(A robot dog from Doctor Who)'s voice "Data analysis shows too many variables." and because of how my mind works it can't stop trying to calculate something until a proper conclusion is reached.
Because of the continuous loop of calculations it has resulted in the what if scenario semi manifesting outside my mind and it has reasoned that if I'm going to be a girl then I'm going to be a baby girl so I can experience my life from being born to being raised and finally living as a girl. Thus the reason why I have been stealing my sisters cloths since I was I was young and why I am sucking on a pink pacifier while wetting the girls training pants I'm wearing while typing this.