I had the chance to be a kinda-parent for a while when I was married. My wife had a little boy from a previous relationship, and I met her when he was 8 months old.
Both the most wonderful and the most painful memory I have. I want to be a mom, have children, but that won't ever be. To me that is probably the worst thing about GID. Knowing you were meant to be a woman, a mother and knowing that it's just not going to ever be.
And yeah, there is adoption, an option I'd definitely look at later in life, but the wonder of carrying a life inside you, of having your child so close to you, of ... well, that can't be. I'll love a child I adopt as much as any biological child I might have had, but creating life like that, nurturing it with your own body and being ... I'm gonna stop now. Can't afford to cry at work.