Physicist’s have an innate curiosity about the world around them and a passion to explore, discover and understand the architecture and mechanisms, that engineer the physical, tangible reality, that we experience phenomenally. We want to describe how the universe operates with precise, deterministic laws using the visual language of mathematics.
I personally, decided that I would not be happy doing anything other than theoretical physics and mathematics, about a year and a half ago while I was dissociated and trapped in an intense k-hole. Ever since then, I have devoted all of my time to studying and practicing my maths and phyiscs, so that I can hopefully do theoretical physics. I did not do any math in high school, other than Algebra and nearly failed high school. It was about a year after high school, that I made the choice to go to college and do nothing but physics and math (although, I live with my gf so she sort of gets more attention than the my work, but very soon she is going to have to accept that studying will require more time than now). I had to relearn algebra up through calculus II on my own because I was very far behind. If you want to do phyiscs, all it takes is motivation.
Anyways man, I don't think there is anything specific -- I had no idea I was doing physics until I was 19. I had always been interested in physics as a young kid (6-13) until I started doing math. Since I never grasped how well our projections of geometry and mathematics, describes reality -- I absolutely despised math. After constructing a model in my head, connecting all the aspects of physics, mathematics and geometry, I couldn't imagine doing anything else. All it takes is one experience to completely transform your perception of the universe.
Also, we know a lot of information, about a lot of physicists, especially if you follow their work at all. I actually know less about the guys you mentioned, than some of the other theorists working on modern problems that I follow.