Correct measurement of bp in the higher reading side ,with average of 2 readings taken 1 minute apart is considered.
The home measured BP if it's more than 135/85 on different days is considered as hypertension.
If you fall under the above category ,for next 6 months you should try diet modification with restrictions salt intake, plenty of salads fruits and vegetables plus exercise for 30 minutes a day for 5 days in a week.
Next Steps
Since you are only 26 and your BMI is being normal ,get your blood test ECG done