My definition of growth mindset is the same as yours.
I don't identify with it so much as I think of it as my baseline. Does this mean my baseline has changed? Absolutely.
It's still irksome because I too enjoyed looking for opportunities to improve myself or the methods I use to get things done. Now, I just don't give a fuck.
I love being challenged, believe I can change to meet most challenges I face, and enjoy looking for opportunities to improve myself. This is how I’d understood the concept of “growth mindset” from Carole Dweck’s book Mindset.
Maybe the difference for me is that none of these things are core components of my identity? It’s just a way of interacting with the world that I find interesting vs. something I feel compelled to go all-gas-no-brakes on all the time.