This comes up rather often and I explain some of these each time, but I don't think I've ever written down all the reasons why I don't drink alcohol. Occasionally I wonder even just to myself why I don't so now seems like as good as any to list at least a few of them. They won't be in any particular order of importance.
I haven't started already; why start now.
Alcohol is expensive. I've seen restaurant bills double or triple just because of alcohol.
I've never drank so I don't know how much I can handle.
I don't have anyone I trust to be around when inebriated.
I don't trust myself to know what would happen if I happen to get drunk.
Alcoholism may run in the family; both of my Uncles were alcoholics for a very long time (if not still).
I don't believe alcohol should be required as "social lubricant".
I dislike social events that revolve solely around drinking and talking about things drunk people have done.
Most of the time I consider drinking is when I'm alone; absolutely wrong time/reason to take up drinking.
Added: Something about the smell of beer is repulsive to me. No idea why; maybe it's psychological.
Added: I'm somewhat paranoid about doing something risky sexually if impaired. (I'm paranoid about that in general too)
Well, while I'm here let's make a list of why I should start drinking:
More choice in beverages and flavor variety.
Less awkward at social functions when declining alcohol.
Might make approaching guys or just being social a little easier. Might.