You got lucky and had kid(s) that were not extremely difficult to raise. Not everybody gets that. Not all kids are alike. Some will make your life a living hell. It is a total crapshoot.
Also, not everybody enjoys parenting, even if they have easy kids. We are not all built the same.
I did get lucky and had relatively easy kids. I love them. But, I do not enjoy parenting.
I love my kids and they're pretty great (and seem easy by comparison to others), but it's definitely burdensome and hard.
People can obviously make the opposite choice, but I'd encourage anyone that's never been around good little kids as an adult, to find a way to be around them in a helpful or fun role for a while. Volunteer at a youth group, sports camp, coding class, whatever. Or just be an "uncle" to some of your friends' kids. My volunteering at a church youth group in my early 20's probably gave me the nudge I needed.