The feeling you're describing is called anxiety. Some anxiety is normal, but constant anxiety that interferes with your life is a problem. I think it'd be worth trying that label on: call it anxiety, and ask "how do I reduce my anxiety?". About 1 in 4 people experience an anxiety disorder at some point in their lives, so there's a lot of research and good approaches out there.

One thing that stands out to me is that you've made some pretty big and scary claims without a lot of evidence to back them up. Are you actually not a good developer? Are smart people really "capturing" the opportunity (ie there is less opportunity over time)? Do people who aren't working all the time fall behind and never make anything of significance?

If so, prove it! Figure out what evidence you would need to definitively answer these questions, and research or experiment until you have that evidence. Anxious thoughts are like dreams: they seem perfectly reasonable in your head, but when you try to bring them into the real world they fall apart.

As far as evidence goes, I'd point you in the direction of two of my favourite Richards. The one who did Clojure: https://www.youtube.com/watch?v=f84n5oFoZBc and the one who got a Nobel for Quantum Electrodynamics: https://www.asc.ohio-state.edu/kilcup.1/262/feynman.html