"I'm mad" means you're mad at something I've done. An action. I can fix that! I can apologize, do it differently and move on.
"I'm disappointed" means I am fundamentally wrong. Whatever the action was that made you mad I can't fix because it came from a place of me being broken deep down, somewhere unfixable.
Disappointed to me feels doomed, heavy and terrible.
To me the exact opposite of disappointment is pride.
I feel proud of myself when I make choices that I know are better for me. When I make the choice to do something that will result in a good outcome I feel good! Sometimes there is a delayed gratification on the scale and t…