I think people take to a certain instrument, or instruments, where it just seems to come naturally, the bass did for me, id messed with keyboards, never got on.
I started playing the double bass at school(never formally or taught mind), then I got hold of their Westone thunder, and that was it I was hooked, my parents were adamant that i should play the guitar as the bass was somehow restricive(never did work that idea out!), which I tried, and it just didn't flow, the guitar just felt awkward and fiddly. So convinced dad to buy me a £50 Marlin bass, and that was it.