21 year old male, severe health anxiety and white coat hypertension. why am i always aware of my heart beat? my rhr is low, like 55, but i can always feel it beating and the beats feel forceful. anxiety?

Hard to guess: That is the curse of having health anxiety. Normal bodily sensations and abnormal bodily sensations all are perceived as signs of illness... making it very difficult for the patient or a doctor to tell when the patient is actually sick (other than suffering from health anxiety). The patient must teach himself which of his pains, his cramps, his sniffles, etc., are normal. His primary Dr. can help.