I wanted to be a dad. I was scared out of my motherfucking mind about being a dad, but I knew I wanted it. Turns out I'm not so bad at it. It's a ton of work, but it's the most rewarding thing I've ever done with my life.
That said, there are a great many people I know that have determined childrearing is not for them, and that is an awesome decision for them. It isn't what they want to do, and rather than permanently detour the life they want, bring a child into a family that really doesn't want it, and hold resentment forever, they have put themselves on the path that works for them, and that is fantastic. People who decide to have a family and then feel surprised at the work it entails can lick the least wiped part of a hobo's asshole. Sure there are surprises and things you can't necessarily anticipate, but one can't possibly expect it to be a cakewalk. I have no sympathy for people like that.
People who know their strengths and weaknesses well enough to balance their decisions with their deep desires deserve respect for making the right choices. People who just don't think and then complain about the results deserve what they get.