welcome Dagz,
Alcoholism doesn't have a type. It goes after everyone, young/old, rich/poor, atheist/religious, every ethnic group or belief system. Your body is giving you the warning it needs you to stop. No two alcoholics got to their bottom alike but we all reached our breaking point. You're at yours and your body is telling you. Good thing is you're so young and your body will fix itself with your decision to stop drinking. I would suggest going to a doctor make sure that the "liver" pains aren't a sign/symptom of anything else.
You need to stop drinking, get a plan/program of sobriety.
Good luck and many prayers.