(attached) is another copy of the Harvard compiled studies related to sexual dysphoria...i.e. gender identity problems...a lot of work has already gone into this subject, long before most of us became aware of it...the preponderance of the evidence points to differences that have nothing to do with upbringing or life experiences.
Link: https://sitn.hms.harvard.edu/flash/2016/gender-lines-science-transgender-identity/