My diastolic bp is always low (60)

Hi sir/ma'am, I'm a 17 year old male, quite fit, bmi 24.7... Whenever i check my blood pressure, it is always around 140/60 or 130/60...when I'm calm it goes down to normal systolic around 125... But the diastolic is always less than 70... This is really disturbing because I experience a bounding pulse in most parts of the body.. I do have anxiety about it. (health anxiety since lockdown) (I've been taking homeopathy for that and I'm better) .. But i have been controlling it...i also try to control diet..i do regular exercise too.. My questions are: 1.Why is my diastolic blood pressure not coming back to normal even if i cope with everything? 2.when someone has high bp... Usually both number go up for them... Why mine has gone up and down. (syst up amd diast. Down)? 3.i know it is mostly anxiety... But is mine different? I hope you read fully... :')