I am willing to change and grow.

Willingness arrives before ability, and it's a far smaller thing to possess. It requires no plan. It requires only that you haven't already decided no.

It looks like signing up for the class you'll be visibly bad at for the first two months. Sitting in the back row of something at forty, being the worst person in the room and coming back the following week anyway.

Most people who never change aren't incapable of it. They simply stopped being available to it at some point, quietly, without ever announcing the decision.