I have no children and want no children. I always thought I would have children, was married at 18 , but no babies ever came. By the time we were in our early thirties we gave up, and decided to let our lives go to the dogs! ( and now cats too!) Back then it used to bother me that we couldn't have children but now I could care less.
I do think the worst thing about children would be the worry. I applaude all of you who do have children as I could never bear the worrying. I know how I worry about my furkids and they don't have to go to school, or drive or move away.