If your child comes to you and says that they are a boy not a girl, you didn’t lose a daughter. You gained a son.
If your child comes to you and says that they are a girl not a boy, you didn’t lose a son. You gained a daughter.
That’s the reality of the situation. Grow up and deal with it. Don’t punish your child for being who they are.
And also? Daughter, son, all of the above, or none of the above, you’ve gained a deeper understanding and closer relationship with your child. That is a fucking gift. They don’t owe you shit about their identity, if they feel like they can’t tell you they’re allowed to feel that way, but they gave you that trust and that truth.
Cherish it.
Cherish them.