Pain in my upper left chest? occasionally in other parts of chest?

This pain has been like going on and off. Like nearly every hour or two for the whole of today, and end of yesterday. Last night I struggled to sleep because I had this pain. It's more like a pain/burn type of pain. Sometimes I can very faintly feel it the middle and right side of my chest. I am a 13 year old boy(I just turned 13 on May 8). Please help me!! I'm scared it could be a heart attack!