I'm a 17 year old junior. I didn't learn to throw my curve until I was a freshman, And i didn't use it regualrly in a game till Sophomore year. Now I can locate it well and have sharp break, so I throw it quite often. I would say 25% of my total pitches are curveballs. Prolly 65 % fastballs and 10% change ups. I really want to spend this summer working on my change.
I don't see the curveball as an overrated pitch. Every high school pitcher thinks he has a good one, but most really have a spinner with little movement. Or movement but not tight spin, so it is easy to read.
Overused....maybe. I tend to think I throw too many of them, and I will prolly tone it down some next year if my change progresses.
As long as it is thrown correctly, no damage will be done to the arm though.