While it’s true that reducing blood pressure will require you to incorporate some lifestyle changes, you can make some changes without affecting your daily existence, and they may be sufficient to free you from having to rely on prescription blood pressure medication.

5 Steps You Can Follow
1. If you are a smoker, stop. Nicotine results in constriction of your arteries and increases your heart rate. Constricted arteries and an increased heart rate imply high blood pressure, and getting rid of their cause leads to lower blood pressure.

2. If you have to lose some pounds, do it; reducing blood pressure through diet and exercise normally reduces the need for medication. Exercise by itself is enough to help people not severely overweight, to reduce blood pressure, provided it is aerobic exercise–walking or jogging, cycling, swimming, or anything that makes them physically active for 30-45 minutes daily, 4-5 days a week.

3.

I see others have already explained that high blood pressure as a rule has no symptoms; that’s why it’s called the silent killer because people feel so OK they don’t know anything is wrong, and don’t get treatment. No one here can diagnose you, but it doesn’t sound like you have high blood pressure. You could however have a few other things going on. You need to be seen by a physician the tell what has been happening to you….and do it soon. Your parents know about this, right? Tell them first, and then get to a doctor.

High blood pressure called the silence killer,the condition itself causes no symptons,it set the stage for a heart attack or stroke.

symptoms of high blood pressure:
headache
dizziness
blurred vision
nausea

High blood pressure usually causes no symptoms.

Even if high blood pressure does cause symptoms, the symptoms are usually mild and nonspecific (vague, or suggesting many different disorders).

Thus, high blood pressure often is labeled “the silent killer.”

People who have high blood pressure typically don’t know it until their blood pressure is measured.
Sometimes people with high blood pressure have the following symptoms:

Headache
Dizziness
Blurred vision
Nausea

People often do not seek medical care until they have symptoms arising from the organ damage caused by chronic (ongoing, long-term) high blood pressure. The following types of organ damage are commonly seen in chronic high blood pressure:

Heart attack
Heart failure
Stroke or “mini stroke” (transient ischemic attack, TIA)
Kidney failure
Eye damage with loss of vision
Peripheral arterial disease
Outpouchings of the aorta, called aneurysms

Here is a whole article about teens and high bp:

There have been several articles written on the subject. Try Googling teens high blood pressure