I cant stop drinking. How can I stop?
You are alcohol dependent, and will need help.  You can't just do it on your own.  Try any AA meetings?
What do they teach you at AA meetings?
They have people who are alcoholics who have stopped drinking.  Their purpose is to "stay sober and help other alcoholics achieve sobriety." Go to a meeting!
What happens if I relapse?
Well, I think most of them have had the recurrence of alcohol use after they quit.  They could help you handle it and start again.
How do I go about attending an AA meeting?
Look up Alcoholics Anonymous on the White Pages on the web.  You can find a place near you.
Okay, I will. In what ways will being sober benefit me?
Twelve-step program
A twelve-step program is a set of guiding principles outlining a course of action for recovery from addiction, compulsion, or other behavioral problems. Originally proposed by Alcoholics Anonymous (AA) as a method of recovery from alcoholism, the Twelve Steps were first published in the 1939 book "Alcoholics Anonymous: The Story of How More Than One Hundred Men Have Recovered from Alcoholism." The method was adapted and became the foundation of other twelve-step programs which support recovery from drug addiction, as
states "Well-supported scientific evidence demonstrates the effectiveness of twelve-step mutual aid groups focused on alcohol and twelve-step facilitation interventions." 
Relationship with institutions.
Relationship with institutions Hospitals.
Many AA meetings take place in treatment facilities. Carrying the message of AA into hospitals was how the co-founders of AA first remained sober. They discovered great value of working with alcoholics who are still suffering, and that even if the alcoholic they were working with did not stay sober, they did. Bill Wilson