70 bpm is not fast. My wife's resting rate is 90-100 when her BP is 110/76.

But, before being concerned about your heart rate, you should be checking your BP. BP is the more important number. Home BP kits are affordable.

The sensation of feeling your heart rate is not normal. The brain usually ignores it. When anxiety levels increase, the brain increases its ability to sense a pounding heart just as it increases its sensitivity to every sensory stimuli. The PCS brain has a harder time ignoring things that it should be ignoring.