I still can't fully articulate even to myself why / how I changed my mind about having children. I had many of the same reasons as people here for not wanting to, and even now four years into parenthood objectively they still stand.
I absolutely loathed children. Really annoyed me being around them. Found them annoying, noisy and grubby, boring too. I genuinely had never once seen a child I deemed cute. All I could see were downsides, loss of independence, finances, risk to your career. Like a pp, I was also besotted with my cats, if I felt that way for my cats, then caring that much or more for a child would be agony.
But I did decide to have children. I think (but like I say, it's hard to be exact) I unexpectedly got broody. I started to receive news of other pregnancies with twangs of envy. And my DH is awesome with children, totally wonderful, if he hadn't been there's no way on earth I'd have done it. He's better than me. Then I looked at our comfortable relationship and careers and bizarrely started thinking it would be fun to shake it up with small people. The only other option was jacking in my home and career and going off and doing something crazy and I suddenly had an epiphany I was more cut out for a life of parenthood than bohemian living I'd spent the last twenty years assuming I wanted.
Of course, so much of the predictable happened - I've got fat, a buggered body, no time to myself, we're skint because we needed a bigger house, my children are noisy just like any other. Less sticky though. I have no regrets, I even think my children are insanely cute and fun, but I would never ever question why a woman wouldn't want this life, because there is still a bit of my brain that logically says "why would you?".