High BP of 150/110 at the age of 17.

Please help Doctors.I am just 17 years old and have high BP. No cardiac issues. Echo is normal and ECG reads "probably abnormal ecg,slight ST depression,to exclude old inferior MI" but cardiologists say my heart is perfect.Sometimes I also feel chest cramps and pains especially on the left side.But I am having rising BP since 2017 or so.Back then it was 130/90 which got up to 140/90 and now 150/110. Pulse 84 and heart rate is 95 BPM.My weight is 72kg and height is 5 feet 5 inches.Recently my TSH levels were 3.14 millimeters and haemoglobin was 13.10.I do not drink or smoke but worry a lot,and have stress issues. I drank banana stem juice for a week and went to gym and my BP reduced for some months. But recently I am having high BP while going to any physician. so doctor advised me to get a bp machine. i am using it and getting consistent readings of 150/110 or 144/100 .Shall I start medicine or a change in lifestyle can make it normal again?Please help.please.thank you.