The curse of having access to a computer years before your first typing class and never being able to un-learn your self-taught method. I know the pain.
My self-taught typing method uses “whichever finger is currently closest to the relevant key”, and has a lot of hand movement – might have something to do with my being a pianist.
Honestly if I had taken a typing class, I would probably have carpel tunnel by now. My hands attack the keyboard at an angle over the left shift/ctrl and right arrow keys. Typists, at least when I was in school, are taught to attack straight up through the ZXC and M,. keys, which keep your wrists at a bad angle.
I made a conscious effort to unlearn bad habits in my 20s and it was pretty easy. I definitely press some keys with the wrong fingers, though. (1 is especially annoying to press with your pinky, so I don't do it.)