Stuttering as a teenager has both advantages and disadvantages. I tell you here advantages.You are aware of your body and emotions.You are still improving and you haven't really started your life, meaning life is a still playground for you. You have still a couple of years before college to change the rest of your life. You are already aware of stress. You should get psychological help to reduce it. Also accept your stutter and tell yourself that you have no problem with that. On the physical side, you have pretty much things. Airflow technique helps you open the blocks at the beginning of sentence. Inhale, exhale for 1-2 seconds with the intention of giving air out naturally from the open mouth, then start talking for 6 second. You should also improve your articulation. You should master these skills first in your comfort zone.After gaining self confidence , you can use it everywhere. Airflow and correct articulation are the strongest guns.Use them, as not to be a victim.