Hello and welcome to HealingWell. I am sorry to read of your problems but it is good to know the ER physicians did not find any acute problems with your heart. Have you talked with your parents re these pains and what to do next ?
It may be anxiety causing the pain as when we worry we often have physical symptoms that pop up. We do have a great anxiety forum if you want to post in that forum you will find the members know a lot about chest pain induced by anxiety.
We do not diagnosis here in the forum only share our personal experiences so look at following up with your own Dr. at your clinic. ER's only deal with acute care emergencies and they cleared you heart; your private Dr. can check you out for other causes of chest pain.