My Blood Pressure Is 128/84 and I'm 17?!

I had a physical Friday and my blood pressure seemed high; 182/84. The nurse took it right as we got in, I did a lot of walking prior.

I don't understand why it's so high; My BMI is 25.7, ( It could be slightly lower) I work out everyday, and I play a physically demanding sport, lacrosse, therefore I'm running six days a week. My physical activity is high.

I do have a sort of stressful lifestyle. I go to high school, work a full time job ( 35+ hours a week) play lacrosse and on top of that I am a pilot and fly 2-3 times a week. Maybe this is the reason?

My diet could be better. I don't eat veggies, but everyday at school I eat all the fruit they have available; Because of my job and lacrosse I only have a home cooked dinner once a week; I usually don't eat dinner but a snack once I get home at 11pm.

I drink a ton of water and naturally brewed green tea.

So my question is what could be causing this, should I be worried and how can I lower it?