In first installed Linux in 1996. And have been using it since then.
Prior to that, I had been using Solaris & IRIX operating systems at school. And DOS at home.
(Solaris & IRIX are both flavors of Unix.)
I preferred Solaris & IRIX to DOS. So when I discovered Linux, I was able to install something similar to Solaris & IRIX on my home computer.
Also, being able to look at Linux's source code was interesting.
But, that is how I became, and continue to be, a Linux users.