I'm sad that nothing makes me more sad than the thought of having to be an adult and do adult things.
What makes you so sad about getting older?
Because I don't want to grow up, I want to be a boy forever, I hate the idea of getting old, etc.
Being an adult is scary but it can also be a lot of fun. You can do a lot more things and you don't have to ask permission.
I don't want people to bring up depressing topics to me.
I know, but this is just another part of the life process. It is okay to have to do the adult things, just find something that makes those adult things more worthwhile.