I've never regretted not having children. My mindset in that regard has been constant. I objected to being born, and I refuse to impose life on someone else.
I think that if you become a parent, you stop being a child, and your position in relation to your parents changes.
My earliest memories are sitting on the beach at Blackpool, and I know that if I went back, it would be horrible. I know what Blackpool's like - it's nothing like I imagined it was as a child.