If you feel your chest expanding you're breathing from your lungs. Chest equals lungs. Stomach equals diaphragm. As deep as you can get. If your shoulders are going up and down you're breathing from your lungs.
Lungs are higher up.
Relax those muscles. Stop expanding your chest and raising your shoulders. Okay, here's another justification for you. Resonance Resonance is a reinforcing of sound wave echoes so that some frequencies in essence get amplified more than others. Resonance is what breaks the crystal goblets when singers hit just the right note in just the right way.