We all used to drink because we're alcoholics, but our drinking was made easier by certain triggers, situations, and thought patterns. Staying sober seems to include understanding them and deflecting them when we see them coming. AA can help with this. So can various outpatient programs. You might try googling "Alcoholism treatment" in your town.
As far as being ashamed, don't be. One of my groups includes a doctor, lawyer, a local newscaster, and the superintendent of a local school district. This disease affects all types of people.