What is causes me to have sudden shocking like pain in my left mid chest area? I've heard it can be normal but heart problems are common in my family

Not heart. Sudden shocking chest pains in an 18 yo male are very likely to be related to the musculoskelatal system and not the heart. Doesn't mean you shouldn't worry, but you can put that worry off for another 30 years. If your family hx is as bad as you say, might be reasonable to obtain a single cholesterol value to make sure you are not at any excess risk.