I'll second or eighth or whatever the advice. I turned out to have a hereditary enlarged heart. I'm 36, diagnosed at 32.

That said, mine was not sharp pain at all. Doctor kept asking me if I had "shortness of breath" but it was more like my breathing was fine but not accomplishing as much as it should, and there was sort of a feeling of dread across my whole chest. Hard to describe succinctly.

Could also be pulmonary. Or just muscular and we're all panicking for you over nothing.