Nobody on here is a cardiologist, so we can't tell you for certain anything about a medical diagnosis. What we can tell you is the docs have diagnosed you as not having a heart problem and it's highly unlikely you'd have one at your age. Until your anxiety attack you had no inklings of a heart problem and no pain in the chest. It's possible that a coincidence happened at that time and you tweaked a muscle doing something, as what you're describing isn't really necessarily heart pain. You've been told it's probably anxiety because you say you had a panic attack, though you don't say on here if this is a continuing problem or whether it's the only panic attack you've ever had. If you look on the archives just of this one little forum you'll see so many young people thinking they have heart problems when they don't. Based on the evidence, if this was a friend talking to you, you'd probably tell them they had developed an anxiety problem at least enough to cause the one panic attack, and the trauma of the attack probably caused these pains given your docs have found nothing going on there. That leaves you dealing with the anxiety. If it was just one and done, it happens and it doesn't necessarily mean you'll ever get another one or that it's a chronic problem. Counter that, however, with the constant worry over a pain you probably would have ignored before the panic attack and you would probably tell your friend to see a psychologist who specializes in anxiety treatment to nip this thinking in the bud.