I have had this thought too, but not sure I would phrase it the same way. For context I'm an older father who had kids mid-40's and had a lot of time to try life the other way, and a lot of time to observe friends life paths beforehand.
The reality is that family, and especially kids, are just better and more rewarding than anything else. That's the part I think gets lost in the narrative. Needless to say there have to be exceptions to that, and maybe you or someone reading this is one of them.
But in general, that's the reality. I was kind of surprised by it, even though everyone had told me variations on this story for decades. I think it's a little bit impossible to understand just how wonderful it is to spend time with your own children, and help and watch them grow, until you start doing it.
I always thought I had no interest in kids. Turns out I just don't like other people's kids much. Still don't really, it's not like I'm going to go play with other kids for fun, or be a school teacher or coach or something. But that's not the same thing at all. If you don't have kids the reality is there's nothing in your life you can extrapolate from to actually understand what it feels like.
In addition to that, as you get older you realize that most intellectual interests and passions aren't going to ultimately be meaningful to anyone.
That's fine, it's not what they're for. But every year it gets a little more impossible to delude yourself into thinking that somehow you're going to transcend the relatively mundane reality you're actually in. Your train set, or collectible collection, or whatever it is, isn't going to have enduring value, to anyone. Again, that's fine.
Perspectives change. Sometimes it makes me sad, and I wish I could have the delusions of youth back, and think that I was so close to the big breakthrough where it would all click.
It's natural to miss all that. But being older is pretty great too.