Im 16 with panic and anxiety. how can i tell the difference between a panic attack and a medical emergency?

Your Age: It is so unlikely to have any medical emergency from your breathing or your heart at your age with an other wise fully normal medical history that almost all things you experience are most likely your body's way of experiencing your stress. This is a good age to begin to learn through therapy and life experience how to manage your feelings better and to not let them spiral into pain or panic.