You may have mitral valve prolapse. I had similar symptoms when I was your age and was told it was "anxiety". As I got older, the symptoms got worse and I finally found a doctor that listend to me. It was found that I have severe MVP and I was experiencing PVCs (the gasping feeling). I am on meds now, and don't have nearly the symptoms I once did. I hope you find the problem soon.
Acid indigestion usually does not cause palpitation. When a young lady has palpitation usually it is not a serious problem and often associated with anxiety. The best way to know is to have an electrocardiogram (EKG) at the time you are having the palpitation. To get a recording, it is often necessary to wear a heart monitor for 2 to 3 days. Sometimes, asthma medicine can cause palpitation.
"Deep gasps with panting” can be caused by asthma especially with exercise, nervousness or anxiety/panic attack, poor physical condition, other lung disease or a heart problem with or without palpitation.
You should have the heart monitoring and a chest x-ray and spirometry, a simple breathing test, which provides detailed information about how your lungs are working and will show if there is obstruction in your airways.
If you suffer from chronic anxiety, you may benefit from a tranquilizer medicine.