okay...im quite worried. I m fifteen years old, turning 16 and i went for a run/jog today. I m not overweight but i do try and keep relatively healthy. When i run or jog, in under 2 minutes, i get shortness of breath , chest pains and my throat hurts making it hard to breathe. I have a feeling its my heart. I m quite young so i don t see why i should suffer from such a condition, however i knew this 12 year old guy who has died from cardiac arrest . So what i m wondering is, is it my heart? I really really hope not. The symotoms i have seems to say so...my chest really hurts and i cant breathe for long. My legs dont hurt, its just my chest and thorat that makes me want to stop, even so when i do, it continues to hurt.