I was also a guy who ate fairly well, thought he was in shape, exercised alot, weighed the same as in my early 20's, had no really bad family heart history, but, in my early 50's, I started having occasional chest pains when exercising. Nothing excruciating, just felt like burning in my chest when I began exercising and then it would go away. Talked to my Doc about it multiple times, had EKG's and even a treadmill stress test but they kept telling me everything was normal. They told me it was probably acid reflux.
Finally, at age 60, just a few months before a scheduled elk hunt, I had a few chest pain episodes that were real bad. Saw a cardiologist and he had me do another treadmill stress test. He said the results were "abnormal" and "might" indicate a blockage. He sent me for a "calcium score" test. Supposed to show level of calcified plaque in your chest. He said my result on that test was the worst he'd ever seen in someone who hadn't already had a heart attack. I was sure it had to be some kind of mistake but we agreed to do an angiogram. Turned out my 3 coronary arteries were 70% blocked, 70% blocked, and 100% blocked. They said my body must have somehow created some kind of "bypass" for the blocked artery or I'd be dead. They admitted me to the hospital and scheduled me for a triple bypass 2 days later.
That was year and half ago. For me, surgery wasn't that bad. Absolutey sucked being in the hospital for a week but I didn't find it nearly as painfull as I've heard from others. Walked out of the hospital 4 days after the surgery was walking 3 miles around the neighborhood a week after that.
You never know. If you're having any sort of chest pains, get it checked out thoroughly.