Is there something really wrong with me, because I get shortness of breath? and I'm so scared

My health is fine,blood is good,but every time I'm in my back room I get shortness of breath,like cold short amount of air come out my mouth ,i hate it so much,i feel like dying because,I'm only 16 and I'm healthy and I don't need this stuff in my life..so can someone help me, why I get this problem,is it because my backroom is stuffy,or dust is in it?please help me
Is there something really wrong with me, because I get shortness of breath? and I'm so scared
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