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While masturbation usually happens when one is alone, I dunno if alone time has to do much with it. Ofc human beans tend to favor privacy, but primates for example do it openly. Our habit comes from social norms, the instinct to do it is more primal.
Masturbation and drinking are similar surrogate activities how is it called in English when one do something useless instead of doing what he has to do, I don't think of procrastination, while has similar effect, so it's rather correlation than causation.
Drinkers has five types/levels: occasional drinker, drinker, occasional heavy drinker, heavy drinker, alcoholic. The occasional ones almost exclusively drink socially. The other two mostly. An alcoholic will most definitely drink alone, great many times, and depending on his situation he can entirely.
I do agree alcohol is used by people to medicate away problems, one such is loneliness. But as I wrote in this regards is liek masturbation, they do it to make themselves feel temporarily good, instead of fixing their problem (loneliness).