Is it normal to hear your heartbeat when you have headphones on?

Yes: It is normal to hear one's heart beat in various situations, one being when your ear pushes against the pillow. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!