I don't see a reason personally to tell anyone until a situation arises where I may need to. Today, if the topic comes up, I am just pretty frank and say that I always reacted bad to alcohol and just better of without. I really don't care for the term "alcoholic" that much. It conjures up a certain view which does not cover everyone and on the other side it tries to cover everyone when each person is unique. I think "always react badly" is clear enough. Frankly, I think we all suffer from the "human condition". We can take that and learn to go to the extreme of joy or pit of hell and fully believe we have the most influence on which direction we take.