If you have long hair, and you do, then you like your hair. Otherwise why would you have suffered through the awkward stage? You wouldn't have, which means you want to keep it long, which means you don't want it to break, which means you want it to be healthy, which means you don't want to damage it.
Things that damage your hair:
And the #1 most damaging thing you can do? Cutting it off. Hair on the floor is not healthy, it's dead.
So try to avoid those things, and keep those locks healthy, flowing and growing.