Re: Confused/Worried Social Drinker
Blackouts are a warning flag for alcoholism, no question. However, it sounds like you are trying to be a responsible drinker. The obvious solution would be to simply become a non-drinker. I myself am what I call a "voluntary abstainer" because I have worked in the addiction field for 35 years and felt it was inappropriate for me to drink for obvious reasons.
The pattern you describe is atypical and a bit troubling, since you have difficulty predicting when you might experience a blackout. I will say that it is definitely not a normal reaction to moderate consumption of alcohol.
If you choose to continue to experiment with alcohol, I would advise you to have a thorough physical examination by a physician. It is possible you have a liver dysfunction which may inhibit your metabolism of alcohol. In chronic alcoholics, tolerance for alcohol eventually decreases because of liver damage. This means that after years of high tolerance, chronic alcoholics often experience blackouts after consuming very small amounts of alcohol. That does not appear to fit your self-report, so perhaps there is an underlying problem.
Good luck and good health!