I got a lot of some sorts of chest pain, but it's due training. My chest muscles are growing all the time, you see. If the doctor took a heart film, and listened to your heart, and didn't notice anything abnormal. I'm sure you got nothing to worry about. Also pressure applied to the chest may cause some sorts of chest pains, aswell as some trouble with the stomach. Anxiety may also cause chest pains. But if the doctor didn't find anything abnormal in the heart film, or didn't notice anything while listening to your heart. I doubt it's anything to worry about, it might be just anxiety.
However if they didn't make a heart film, then yeah.. I guess you should ask them to have one. You're still really young which makes it extremly rare for you to have heart trouble.. but sure it's not impossible but not just really likely.