What are the symptoms of diabetes?

today i went to the doctor to get my doctor's note to start weight watchers. im about 203lbs and im almost 17 years old, but i exercise regularly and eat right, i don't eat alot during the day, and i have lost weight. my doctor took my blood pressure and it turned out to be 130/90. I also got my blood taken to see my blood sugar level and my cholesterol level. what would be the real symptoms of diabetes or can high blood pressure is heredity? Also both sides of my family have had a history of diabetes and high blood pressure.