Hello, since your BP was significantly high for an office reading the doctor must have started medicine. However I would suggest two options
1. You can take multiple home readings over a period of 4-5 days if you have an apparatus to measure BP at home and maintain a diary and see what the BP is like
2. Or recheck it in the doctors office at a different time after resting for 10min
Also check BP in both the arms
Another option is to go for 24 hours ambulatory BP monitoring (in any centre) to diagnose if your hypertension is indeed true hypertension
If blood pressure is repeatedly high (above 140/90 ) on different days then you need medication
Apart from this if your BP remains high since you are young please check baseline
kidney function test and do a Renal artery Doppler to rule out other reason for BP elevation.