Whenever i am in stress, while doing walking my chest pains a little and feels a bit heavy. however pain stops after i finish walking.do i need to worry?

Chest pain during exercise in a 19yr old can be caused by both benign and more serious problems. You should see your primary care Dr for a full evaluation to rule out the more serious problems.

At your age, a cardiac cause of the pain is unlikely. However, since you describe pain during exertion and relief with rest, one needs to evaluate further. Do other types of physical activity result in the same pain? Is there associated shortness of breath? Although coronary disease is unlikely, there are rare examples of coronary abnormalities that may cause similar symptoms. Further evaluation n