Lol, you're still very early days. Your brain hasn't gotten used to there no longer being a delineation between work and leisure.
It takes awhile for your brain to adjust to a reality where you can push yourself really hard to do things by choice, that you don't need a job to structure your productivity for you.
It took me at least 6 months before I stopped feeling like my free time was supposed to be leisurely, the way it was before between work shifts.
Now my time is just my time, I do a ton of projects, sign up for classes, and help out friends and family with their projects. Most of my days are pretty busy, but rarely overloaded.
I help DH with his work quite a bit, and Indigenous consultation is a big part of a lot of the projects in government right now, and it occured to me that my knowledge of First Nations is somewhat outdated and I'm really not up to speed on current reconciliation issues, so I registered for a 12 week online university course.
That's what being retired is like for me now, 10 months later. If I have a sudden curiosity about anything, it's the easiest thing in the world to commit 12 weeks to study it. Why not?
It really did take awhile to get here, but now time feels nice and fluid. Like I live far more in the present rather than alternating productivity and leisure.
I also no longer feel like things need to be done towards a goal. I don't have to prioritize what I study for the sake of broadening my professional skill set, I can just learn something because I'm interested and I have the time.
I don't have to make all of my effort count. I just follow whatever is interesting. I suddenly decided I wanted platinum blonde hair. No real reason, it just struck me as something I wanted to do, so I invested many hours into learning how not to melt my hair off or blind myself with highly toxic chemicals.
Now...I accidentally ended up with magenta hair, but that's not the point. All I had to do was learn how to fix that, which I did.
My point is, I felt like doing it and I took the time to do it, for no real reason other than it seemed like a fun thing to do. And again, why not?
Give it time, and try to get out of your comfort zone. You are only auto-piloting back to work because that's what your lifetime of habits knows will keep you occupied and stimulated. Well fuck that, try new habits.
Now, I'm not saying never go back to work. I'm quite young and fully intend to work in the future, but in the meantime, I'm fully embracing this new relationship I have with my own motivation and energy.
Oh, speaking of "auto pilot", I'm also reading books about flying, in case I get serious about getting my pilot's license.
Because? You guessed it. Why not?