Like a previous poster knew from age of about 15 that I didn't want children. Now mid fifties and have never waivered. It was a very strong feeling, so don't think it would have been a good idea to go against it, because biologically it was what I was 'meant to do'
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Nettleskeins, I find your posts a bit odd, tbh. My life contains love, joy many interests and friendships and I tbh I think I would have been pretty miserable if I'd had children. I would have probably loved my children and done my best for them, but it definitely wouldn't have been a life I would have chosen. I didn't not have kids for the sake of the planet (that's just an extra plus point), but because I DIDN'T WANT THEM. It's quite difficult to believe that your friends who genuinely didn't want children now regret their decision - the only childless friends I know who regret that state are those who couldn't have children, which is a whole different kettle of fish, and a couple who never found the right person to have a family with. I do know people who had children who bitterly regret it.
I have seen plenty of relationships which appeared solid disintegrate almost overnight when children came into the mix - my lovely SIL still hasn't recovered any respect for her husband and their daughter is 19. I've seen parents on their knees due to their child's behaviour, parents who will have a lifetime of looking after severely disabled children, spending their fifties and sixties having to advocate for adult children with life limiting disabilities.
There are plenty of parents who have no contact with their children - the boards on here are evidence enough of that.