Is this possible?

Last year I ended the year throwing 77-81, now I’m throwing 75-78, I’ve become extremely uncomfortable on the mound, and I find myself struggling and not even wanting to be out there at times. When you throw you should maintain a loose arm, however, I feel like my arm is TOO passive, it feels like I’m trying to make it actually do too little work. Is it possible that someone could not use enough arm? As odd as it sounds?