com/diabetes/diagnosing-type-2-
diabetes Your doctor should
guide you with what to do but fasting prior to the test is very important for accuracy.
Prevention of type 2 diabetes is important to start even at this early age. If you are overweight, begin working on how to lose weight. Exercise regularly (if your doctor says you can), modify your diet, cut sugar and carbs as best you can, etc. https://www.mayoclinic.