hi im 16 years old, 5.3 feet tall and 125 lbs. today in my biology class we all took a blood pressure test for a lab, and our teacher said the average is 120/60. when i took my test it said 137/81. Im fairly athletic, and im a competitive swimmer and i sometimes go to the gym.  is this a big consurn for me?
You are right, that blood pressure reading is not normal in your case. But you should not be panic over 1 reading. Sometimes the technique of checking the blood pressure and even the apparatus may be faulty. Other times the person may be anxious while his blood pressure is being checked, or he might have climbed a set of stairs and suddenly opted for checking the blood pressure without taking some breaths. Anyhow, keeping all the possibilities in mind you are young and that blood pressure reading cannot be accepted as a normal for you however this high-normal blood pressure can be managed without medications by trying lifestyle measures first. I recommend checking blood pressure at home at least 4 times a day and keep a record over a week, if still getting the same readings above normal average then correlate with the physician as further workup may then be necessary. Regards.