My instrument is most certainly the guitar although I can play most stringed things in a fashion and can make a reasonable sound on the piano.
But finding "the instrument" is an endless quest for me, and one I don't ever expect or hope to conclude. A particular guitar can inspire me for months, to the neglect of my other instruments, but when I do eventually pick up one of my old beaters I can find them every bit as head-turning as when I played them for the first time.
I often think of my passion for guitars in the same way one might think of personal relationships, each having their own characteristics, but if I was as flighty and feckless with my personal relationships as I am with my instruments, I'd have to keep moving and changing my name!
My latest "baby" is a 1954 plastic Maccaferri which is so different to anything I've played before (partly because it won't stay in tune) that I can't walk past it.
I thought I might have found the answer with the Variax that I bought last year (a whole range of electric/accoustic guitars, banjo, sitar, dobro, etc, in one package) but I only use it for gigging with, never at home.
As someone once said.."If you marry your mistress you create a vacancy"
C-flat.