Completely self-taught, in the days predating the Internet 🙂
However, the 'net helped a lot in giving me GAS 🙁
Joking aside, I've never had any formal photo education - but I was exposed and introduced to photography in primary school, if I remember correctly. But, that didn't really take hold.
It was at about the age of 19-20 that I got my first camera and started photography for real. I read everything about photography that I could lay my hands on - I read many books and began to learn to distinguish good photos from bad (or average snapshots). I also began immediately to process my own stuff - developing negs and making prints in the local community lab.
I also read a lot about visual arts in general - I think the elementary reading in painting (composition, light, color, etc.) is mandatory for any would-be shooter... Being a movie fan at that time also helped, I guess.
Denis