You don't deserve those downvotes. I think you ask a great question!
I chose to have kids, but one of my best friends chose not to have kids. I sometimes regret it (though never seriously), he deeply regrets it. He had a lot of cool stuff and got to travel the world for many years, which I always wished I could do too. He was always doing fun stuff, even as simple as going on beer runs on the weekend (literally the club he was in would drink beer and go running. They had a blast). In his early 50s his wife was diagnosed with terminal cancer. During that period both he and her went through profound regret. She would pass on nothing, and he would be completely alone when she was gone.
I also firmly believe that there is a level of growth/maturity that you can't reach without going through the crucible of kids. I have never met a person who didn't say that having kids was one of the hardest things they ever did but helped them grow and see life in a different way like nothing else could.
Also don't forget the Michael Scott reason for having kids: they can't say no to being your friend[1]
[1]: https://www.reddit.com/r/DunderMifflin/comments/20u728/i_wan...