I played baritone/euphonium in the school band from 5th- 9th grade. In 5th grade, I wanted to either play drums or trumpet. I couldn't quite grasp drumming technique and could not get a sound out of a trumpet mouthpiece. I could get a sound out of a baritone horn mouthpiece, so I ended up playing that.
During my years in the school band as a bass clef instrumentalist, I learned to absolutely adore bass parts. And whenever kids around me would talk about wanting to play guitar and be rock stars, I always wanted to play bass.
I had a love/hate relationship with music during those school band years. After 9th grade, I quit the school band because I had a massive personality clash with the band directors. So in 10th grade, I got myself an after school job, saved up for a bass at a nearby mom 'n pop music store, took private lessons there... and I haven't looked back since. If I'm any good at bass, it's because of the wise gent who taught me. He was my Yoda and I learned very well under him about bass, life, music appreciation...
I know wind players feel that "mojo" of blowing the breath of their souls through their instruments, but that wasn't me. I love being a string player, especially bass because it's an instrument I can "hug." Playing bass just feels so right to me. It's part of my identity. I could never play guitar. The tiny necks feel like twigs in my hands and my hands get all crowded on the strings.
I'm 41 now. I'm nowhere near as good as I should be. There were lengthy periods of time when I stopped playing, but something always happened to inspire me to put the bass back in my hands.