I always thought I was too immature, too poor, too stupid, too selfish, too whatever to have kids at (insert time) and kept putting it off. Now, we're in our 40s and pregnancy would be high risk and as I see the window slowly closing I regret it. I wish I'd have simply thrown caution to the wind because I think in many ways I needed the rudder that kids would've provided. I'll tend to spin my wheels without much thought if all I have to think about is myself but I've always been a great advocate for others and kids would've likely given me the direction I needed despite all the financial responsibilities they bring.
It tends to be the childless that get shunned because it's rarer for a long term couple not to have kids but no one should ever be talked down to for the choice they make reproductively. Life happens and we all have our reasons/struggles. That said, I'm greatful to every parent that has kids (well except when they're screaming in my ear - lol) because those kids have grown up to become my own when they've been in my classroom. Youth reminds age of the things in life that we can so easily forget if we're not around it.
