I started in music by playing trombone in school band when I was 11. I did very well, but realized in high school, there is more work for rock band instrumentalists, than band/orchestra instrumentalists. I decided on electric bass, since it was the same clef as trombone, and I didn't need to learn a new clef to read the music.
For the first 10 years, I was bad to mediocre on bass, but eventually I started getting better jobs on it, and took some lessons from a well respected jazz teacher. Eventually I gave up trombone altogether, and just dedicated myself to bass.
I have been playing bass for 35 years.