feels hard to breath as if someone is stepping on me?

Hi,
Welcome to the ehealthforum and I am really glad to help you out.

Causes of chest pain are many. It can be due to hypertension,Gastroesophageal reflux disease(do you have heart burn and difficulty in swallowing), disorders involving the lung and cardiac causes and muscle strain. At your age, chances of a heart disease are less. It can be due to anemia or low hemoglobin count also.

In your case, it can be due to cigarette smoking also. it can produce heart disease and cancer is now common knowledge. Many are not aware that smoking also may produce chest pain. Smoking increases the heart rate, blood pressure and work load upon the heart.

Please take an appointment from a physician and get yourself thoroughly examined so that a confirmatory diagnosis can be made.

It is very difficult to precisely confirm a diagnosis without examination and investigations, and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.