from your history, you are young, no history of high blood pressure, no high lipid, no smoking, no high blood suger, even though you have family history of heart problem,but not that young age.
so, most likely your chest pain is not from your heart.
a couple of possiblity, one from your rib, or around nerve, or some muslce around that area, or maybe like you said, you have panic syndrome.
but panic syndrome, usually suddenly heart beat very fast, out of breath, you feel you are going to pass out
you may have chest pain, but not like this.
it is better to observe for a while