What is the difference between heart attack and costochondritis chest pain?

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Firstly, to begin with, the probability of heart attack is very less at this age. Costochondritis pain will increases on applying pressure over the area, if yes, it could be costochondritis. This is the most important sign of costochondritis. Heart attack pain will be very severe on the left side, which is associated with radiating pain to the left arm and a lot of sweating. It will not last more than 24 to 48 hours in severe heart attack and more than 20 minutes in a minor heart attack. Do you have upper abdominal pain, nausea, bloating, burping, increase in pain on food, sour water feeling in throat or chest burning? If yes, it can be gastritis and reflux disease. Does this pain increases on deep breathing, coughing, etc.? If yes, it can be a pain arising from the lining of lungs and may be due to smoking or viral infection. To clear your doubt, you can get an ECG (electrocardiogram) done. Overall, I do not think it to be a cardiac pain. Hope this helps you and get back if you have any doubts.