I secretly hope that I'm sterile so I don't have to reproduce
Is there a reason you don't want to reproduce?
I think I'm not fit to be a dad.
There's nothing wrong with not wanting to have kids. Parenthood isn't for everyone, and you shouldn't feel bad about it.
I should grow up, I don't know why I think like this.
You have no reason to be ashamed. Some people just isn't cut to be parents.