Can a 16 male have a heart attack after masturbating i masturbated last night and after my left arm had a dull pain its still there its now morning?

Here are some ...: Your currently reported scenario poses a very low likelihood from heart attack. In fact, the dull pain as described would be more physically related. If you don't have heart-related Sx such as fast heart beat or short of breath and slowly but surely getting better day by day, rest for recovery with patience & time. If not better as expected or worsening or not sure, see Doc right away.