Everyone is different. I think I would have been fine without kids, but maybe at teeny bit of regret at the age I am now.
My only comment is that I am glad I had mine when I was young, 29 for the first. Around here you are a young mother if you have your first at 35-40! I wouldn't want to have a teen now.
Sometimes, when people come into my husband's office and see their pictures, they say, "Oh, are those your brothers?" They don't believe it when he says they are his kids, despite the fact he has some grey hair.
I too, saw the result of bad parenting when teaching, but you can overcome it, because my husband did. He knew nothing, except verbal abuse and being bought "stuff" instead of time with his parents. I always babysat, have a brother 10 years younger and 3 cousins I also took care of. My husband just watched what I did and in many ways was a better parent than me when they were younger.