The energy, passion, sincere thoughts and feelings. The outlet, I guess you could say. The expression. It kind of becomes an expression of our own individuality in a way, like the clothes we wear. It's part of our overall style, vibe, and character/identity.
I wish I got more into bands and stuff when most other people did, in the teen years. But it didn't speak to me at the time. My friends weren't big listeners back then either, and I guess you do what your friends do, a lot of the time. My attention was more on stuff like toys and fandoms.
And to be honest, I (wrongly, naively, immaturely) wrote music off as something for stoners and dark, mean, "bad", attention-seeking, rebellious people - people that just wanted to, like, be seen and heard swearing and being mean, which I wasn't at the time. I guess, a lot of the people who WERE that way, and DID like those things, were mean, not welcoming, cold. And I didn't want to be like them or fit in in their world.
Now I listen to punk rock all the time, lol. Lots of other stuff too.
Also the Internet played a huge role in finding bands I liked. Without it, all I really knew was what was on the radio, and what the people around me liked. But once I found I liked some songs by a band, I'd go on Wikipedia, and then YouTube and go through their whole discography. I got into a lot of bands and bought a lot of albums that way.