Alcoholism is the only disease that is self diagnosed.
I've been told; and know from my experience; it is a progressive disease.
Drinking alone is certainly one trait of an alcoholic
I suggest you stay here @ SR.com and read as much and get friends....it will help you regardless.
At your age, a lot can still go on in your life and you may turn to alcohol for help. IT WILL NOT.
Here's how many define the progression simply:
FUN.......fun WITH PROBLEMS......PROBLEMS