Obvious troll question.
Nobody, not even trans people "change genders".
Most people are born with a gender identity in their brain that matches the sex of their body; transsexual people aren't. When trans people transition, they are changing their body to match their inborn gender identity, not changing it.
If this somehow a legit question, which I doubt, see your gender therapist
me-woman who was born transsexual (post-op)