To be a kid at heart

I don’t glorify childhood. IN my chaildhood, so many bad things happened to me, such as constant teasing and bullying, and I was helpless to stop it; and I myslef did some dumb things I can’t brag about. Childhood to me is something to move past.

What does it mean to be a kid at heart?

I had a dismal childhood, and I hate to bring it up.