“How do I know if my chest pain is heart related?”

You can't know without seeing a doctor if you have heart-related chest pain and I would be concerned about giving you what might be definite signs of a heart condition because if you did not have the classic signs it might give you a false sense of security (like a negative Covid-19 test, for example, gives people a false sense of security). There are many types of atypical chest pain that reflect a heart condition. You must see a doctor if you have chest pain. There are a couple of points I will make for you. At your age if you are not a smoker and don't have a hereditary lipid/cholesterol abnormality and don't take contraceptive medication, it would be highly unlikely that you have a heart condition involving blockage of the arteries to your heart. But notice I said "very unlikely." I did not say impossible. I would have to qualify almost everything I say like that. That's why you should go to a doctor and have your chest pain evaluated.