I agree with you, in that pretending to drink (e.g Tonic instead of Gin & Tonic) is probably what a lot of us do, and the obvious way out. But the point of drinking is not really being sociable, but making yourself vulnerable. Vulnerability and exploitability is the foundation of trust. By staying sober one undermines one of the core trust formation mechanism: by remaining sober and responsible, you avoid creating exploitable vulnerabilities that others can but don't exploit -- I trust X because X can exploit my being vulnerable w.r.t. Y me, but doesn't.
Note also that pretending to drink feels a bit like cheating to me: I'm actively deceiving others. I wish I could live my life without deceit.
I'm not pretending to drink... I actually have a few, but have a few not alcohol too, I make no attempts to hide it when ordering. I'm generally pretty blunt without much filtering in general, I don't need alcohol for that.
Note also that pretending to drink feels a bit like cheating to me: I'm actively deceiving others. I wish I could live my life without deceit.