This syndrome is called "eternal child" (puer aeternus) in psychology.

You were destined to great things. You were exceptional as a child, you learnt to associate your great potential with all the good in yourself, you built your identity around it. You were ahead of your peers in elementary school, whatever you applied towards - you exceled at.

So you value that potential as the ultimate good, and any decision which reduces it in favour of actually doing something - you fear and avoid with all your soul. Any decision whatsoever murders part of that infinite potential to deliver something subpar (at best - it's not even guaranteed you achieve anything).

Over time this fear takes over and stunts your progress. You could be great, you KNOW you have this talent, but somehow you very rarely tap into it. You fall behind people you consider "mediocre" and "beneath you". Because they seem to be able to do simple things like it's the simplest thing in the world, while you somehow can't "motivate" yourself to do the "simple boring things".

When circumstances are just right you are still capable of great work, but more and more the circumstances are wrong, and you procrastinate and fail. You don't understand why, you focus on the environment and the things you fail to achieve. You search for the right productivity hack or the exact right domain that will motivate you. But any domain has boring repeative parts. Any decision is a chance to do sth OK in exchange of infinite potential. It never seems like it's worth it, so you don't do it.

You start doubting yourself. Maybe you're just an ordinary lazy person? Being ordinary is the thing you fear the most. It's a complete negation of your identity. You can be exceptional genius with problems, you take that any time if the alternative is "just a normal guy".