Slight chest pains

I've been having slight chest pains, and sometimes they aren't pains just a strange sensation on my chest around the left nipple. When I think about it ot is more prevenltant. I do suffer from quite alot of stress and anxiety, I do regular checks on my heart rate and the max is around 140 when exercising and around 70 when resting, sometimes less. It also usually worse when I've eaten which I am prone to eating quite fast. I'm 18 years old. Does anybody think it could be a heart attack, or something else?