Why do I have a fast, hard pounding resting heart rate? I'm just fifteen!? Ok guys, I just tested my heart by placing my hand on it, I had 60 heart beats in just thirty seconds and 120 in one minute. My heart was normal when I was born and through my childhood, and the doctors at the moment I was born said I was born healthy, so I couldn t be born with a defective heart or something, but when I turned fifteen, everything went down south. I don t know why, I m a 5 10 fifteen year old boy with a fast metabolism, weighing 125lbs. I will admit I eat unhealthy, I rarely eat something healthy, and I eat everything that is unhealthy 24/7 nonstop. Can someone help me? I m really scared that I m gonna die. Don t be idiots, help me. Oh yea, I forgot, when I went to the doctors 3 years ago, they checked my entire body and found nothing wrong but one small thing, they said I have severe anxiety.