I'm pretty sure I had the same thing. I'm 24 now and since I was 19 I had occasional pains in my heart, maybe once a week. Sometimes it hurt when I went to sleep, I was also not FATFAT but a bit overweight
and I wasnt eating right at all.
They are gone now though, I only feel them when I put my heart through a lot of pressure. As in if I have a few redbulls when i am out etc. At the time I was worried too but sometimes you can sense when its serious and when its not. I knew the pains were there because I was eating shite and drinking too much but you still worry it might be something worse.
I think you will find it you ease back on coffee/redbull/ caffeine things in general the pain will go completely. Also if you do a few runs, I know its so boring and a total pain but if you do some gentle runs, even once a week for 15 minutes you would be surprised at the difference.
Oh .. if you are thinking of or if you have experimented with drugs as a lot of people your age do , be wary of cocaine/ecstasy
drugs, they will rapidly increase your heart rate
and if ure heart is a little weaker that it should be from bad diet and lack of excercise then it could cause you damage. Just incase.. ! Anyway .. small bit of excercise, ease up on things like butter and grease..cholesterol
can clog your arteries which is the general cause for heart pains.
Anyway I am pretty sure that you will be fine, I think you are pretty sure as well just a little worried. But I'll say what everyone else here says 'SEE A DOCTOR!' but I reckon it will turn out to be nothing.