I feel the same way! And I can't really recall if I had any great dreams as a child, except wanting to go into space (yeah, too late for that). My mother did not keep well while I was growing up so I got busy with keeping the house running very early on - did not really get much chance to try anything - just read a lot as my mental escape and did quite well academically.
Still, after dithering for a while, I have given in my notice and will help company look for my replacement. Been with the company almost 20 years! Its a truly great place to work and I am sorry to go, TBH. Except, I feel like I need to be available for my soon to be 13 y.o. It may make no difference in the end, but I did not want to question myself later. They did talk me into staying engaged and working about 10 hours/week from home.
I also started a course in traditional Indian medicine last year, which I have decided to continue to the next level, though I am having trouble seeing myself in the role of a complementary healthcare practitioner (because it is so different than my career). I have the usual plans to read now that I will have time, exercise, eat better, travel with the family in a more relaxed way etc. Not feeling called to volunteer yet, we shall see.
So it sounds like I have a lot lined up, however, I am having a hard time shaking off the feeling of purposelessness (is that a word?) I enjoy the problem-solving aspect of the job, and since I got higher up within the company, that is a lot of what I do. Its a small company, but we do very large projects with external partners, so it feels like the best of both worlds - not cog like, but not boring sameness. That said, my summers are not off, its hard to stay on track for exercise, always feeling rushed etc is somewhat annoying. If there was a way to work half time and take a good chunk of summer off, I would probably keep working. I know folks on here all mostly seem happy post-FIRE, but I will have to let you all know in a few months how it feels for me.