I always had a strong interest in the natural world, I can't remember this ever not being the case, and I especially remember being fascinated by books about deep-ocean fish, just with how strange and alien they seemed. My grandfathers on both sides were surgeons, and my parents inherited one of their libraries, so there were a lot of medical textbooks around. I remember when I was 7 I liked to show off by naming all the bones in the hand.
I know this is a very old cliche, but what really got me into physics in particular was definitely magnets. I had this box of rare-Earth magnets that I stole appropriated from my 4th grade classroom as a prank for science. I think I may still have them somewhere, actually. The whole concept of magnets was very troubling to my 9-year old self and I absolutely had to figure out what they were doing, so I checked out a book from the school library and was even more baffled by what was meant by "fields" and whatever was supposed to be the connection to electricity.
The next book I checked out was Wangsness' Electromagnetic Fields (It had "electricity", "magnetism", and "fields" in the title, so I figured that it would be a good place to look to get my questions answered. I did not know what I would be getting myself into), and later because I..."forgot" to return it, I ended up keeping it. I had absolutely no hope of understanding it, but I did like keeping it around and looking at the diagrams and reading through the sections that were more qualitative, and naming Maxwell's equations became my new favorite trick. Still have that one.
However, in high school I actually wanted to be a composer, I didn't start getting interested in physics again until college when I realized I liked my math classes much more than my music classes.