You didn’t actually say what hand you were... are you saying you’re a righty with 18 years of experience or are you saying you’re a converted lefty?
I was forced to write with my right hand; i bet West won't find in Romania anyone over 25 writing with his left hand; i had no other alternative those were the times. Now, i practiced a little writing with my left and i discovered i could do it as well; but i will continue to write with my right beacause i lack the speed acquired over time,in writing the wrong way .
Like I said, I'm left-handed (in the sense that I write with that hand) but I was never taught or forced to throw right handed. When I was about 4 we just realized that for some reason I threw like a girl with my left hand but could do a much better job with my right even if that's my off hand. Handedness is much more of a spectrum than an either/or proposition.