Is this heart burn feeling normal?

There are many possibilities: an ulcer, a diaphragmatic hernia, crohns disease, colitis, gastritis or even a severe anxiety attack can cause it. Because your age is only 16 it's most likely not related to your heart. Angina due to heart disease is usually brought on by increased activity. Try some antacids (like Tums or Maalox) or an over the counter acid blocker like Pepcid or Zantac. Let your parents know and if this continues it should be evaluated by your doctor.