Squeak...
Like you, I am self taught. Even got kicked out of piano lessons as a kid...just couldn't relate to the stuff the teacher wanted me to learn.

On top of that, I think I am "keyboard dyslexic" in that I could never tell one white note from another...so play everything in black keys, mostly F#. It was a real hassle when I started trying to figure this stuff out.

C, for instance is +or-6 from F#. Bb up 4 half steps, etc. But once I got all the steps from F# memorized it was a piece of cake.

Seems like every singer, horn or guitar player I work with has different keys. The transpose is must. Couldn't play without it. Thank God for buttons... like transpose, registrations and freeze.
Eddie