Breath problems

Hi, I am 16 years old boy from Norway, For a month ago I started to get breathing problems and I still have it now. I feel like I am out of breath and when I take in deep breaths I feel like I can't fill my lungs all the way. When I finially do, it is a relief. I get dizzy breathing so hard when this... happens. I am in shape, I exersize, and I don't smoke cigeretts.