I Am A 16 Year Old Female And I Feel

I am a 16 year old female and I feel very lightheaded and nauseous. I am experiencing heavy breathing and my chest feels tight. for over a year I have experienced extreme fatigue even though I eat incredibly healthy, exercise often, drink water, and get 7 plus hours of sleep a night. I rarely drink alcohol and juul on occasion, I also drink coffee a couple times a week, but I am not sure if that is causing my symptoms because when I eliminate those things from my diet I am still extremely tired which goes along with the other symptoms. What could be wrong?