I grew up with a family that didn't have a lot of luxuries when I was young. We had three channels on TV, so we didn't spend a lot of time watching TV. So I didn't get to watch a lot of pop culture content for about the first 7 or 8 years of my life.
So one of the first memories I have as a kid is in hearing music on the radio, record player, cassette player or any sound system .... I understood that it was previously recorded and performed by other people somewhere else.
What I thought was that all the sounds were generated by human voices. Guitars? Pianos? Trumpets? Brass sounds? Violins? even Drums or percussion. I thought all of it was people just making sounds with their voices.
I'm Indigenous Canadian so my parents didn't have musical instruments, a couple of uncles played the guitar and fiddle ... but by the time I was young, they no longer played these instruments and had them. I never knew or understood musical instruments really until I was about 8, 9 or ten. Up until then, I just thought all music was just people with amazing and unusual human voices.