What does it mean if my systolic is high but my diastolic is low145-130 over65-50 im 18 i do eat a bit unhealthy but i try my best with diet i also exercise and do cardio regularly however i am obese but not all fat, i have muscle. should i worry?

Either systolic or diastolic # is high then hypertension is confirmed. They may not need to be high in parallel. Systolic pressure of 130 or higher is now defined as hypertension at your age so systolic hypertension is present. You should see a doctor, have blood pressure checked manually x 2 visits for confirmation. Heart exam should be done because of the relatively low diastolic #. Good luck.