28 Male. Recent norm StressTest, ECHO. Healthy weight, norm BP. No Fam hist/non smoker/rarely alcohol. Should mild chest pain concern me? Too young for MI?

Chest pain not heart. It sounds like you have pursued a work-up for the chest pain and it, fortunately, is negative. Glad your risk factors are under control as well. Good job! While 28 years is NOT too young to have a heart attack, with all the information you now know about yourself from the work up and your risk factors, you can be assured that your chest pain is not your heart, I believe. Probably musculoskeletal.