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I think the mental grind of being a programmer can be exhausting. Especially if you work in 95% of work environments/companies. Either you're working with people who aren't passionate, or you're working on boring software. The fact it's very much a sedentary activity doesn't help too, as it saps our energy.

I find uncertainty and confusion and then finding a solution to the problem, to be exhausting itself.

Bike to work, and do an intense fitness activity (like crossfit, etc) 3-5 times a week. You'll be in recovery mode enough that it will be a benefit to be sedentary while your body recovers.

You just need to find an organization with a culture that fits you well, just like in any other profession. If nothing fits with you, then yeah you probably aren't meant to be in that profession.