Every one who is alive have a beating heart but not facing the same problem as your ,,, so it clear that there is some problem.
Next if your heart investigation rule out any organic reason for the same then second most common reason is anxiety
..also you do not have any symptoms except this which point to any other diagnosis..so we can reach to a conclusion that you are suffering from anxiety. And you need treatment for that.
In condition like yours you may need initial medical treatment followed by therapy..but final call be yours and you can choose out of the treatment made available to you.