My violin teacher said the same. I didn’t say it out loud, but called it “I want to play my music, not your music”. Well, 20 years later it turned out my thumb metacarpophalangeal joint got pretty much fused in both hands, so I can barely hold a violin, or a guitar, or even play the piano, and can only play “my music” now…

Wait, this was about “practice”? Nah, good thing I didn’t waste too much time on it back then.