Not having kids means that you get to be selfish. That's pretty much it. If you want to devote yourself completely to your job, you can. I did that for some time. It was fun for some time :-) If you want you can travel a lot. I did that too. If you want you can quit your job and live in a shack by the ocean and teach English. I did that too.
Having children is always going to be a tradeoff. It requires time, energy, focus, and huge amounts of money. It requires you to be responsible, to prioritise and above all to be selfless.
On the other hand, based on virtually everybody I know who has kids (and doesn't have other significant problems in their life), there is a pretty significant payback. If you have a child, I assume you understand that payback.
I realise that it's tempting to want it all. It seems unfair that people who prioritised other things got advantages that you don't have. Trust me, I understand that. I've lived all around the world. I've worked in many super interesting jobs. I've been able to literally say "Fuck it" and forget about money and just do what I want. But I'm never going to be able to go home and give my child a hug. Trade offs.