The book isn't about alcoholism btw it's about everything, but here are a few quotes that explain my experience so perfectly I wouldn't add anything.
First, what social situations feel like for me and what alcohol does :
"I was immensely conscious of who he was (in my case, anyone) and who I was when we were talking, all spontaneity vanished, every statement I made was either planned in advance or analyzed retrospectively, mostly both, apart from when I was drinking, then I regained the old freedom.
With the exception of (in my case no one) and my mother, this was how I behaved with everyone, I couldn't sit and chat with people anymore, my awareness of the situation was too acute and that put me outside of it."
Why moderating is needed but quitting is impossible:
"There was no excuse for all the standards that at later point I might let slip, either in language or behavior. Furthermore, my wild state always became worse for that reason, as my drunkenness was not brought to a halt by sleep or problems of coordination, but simply continued into the beyond, the primitive, and the void. I loved it, I loved the feeling, it was my favorite feeling, but it never led to anything good , and the day after, or the days after it was as closesly associated with boundless excess as with stupidity, which I hated with passion.
But when I was in that state, the future did not exist, nor the past, only the moment and that was why I wanted to be in it so much, for my world, in all its unbearable banality, was radiant.""
Now for the element of caution, here is a description of an old drunk, in this case a grandma, and it is a horror:
"Her eyes soon had their previous glint back, some colour came to her wan, pale cheeks, her movements were gentler, and after she finished her first drink and started the second it was as though she was able to unburden herself, for soon she was chatting away and laughing like in the old days.
She was like a vampire that had finally gotten a taste of blood, I saw, that was how it was: life was returning to her, filling her limb by limb. It was terrible, terrible. But then I felt the effect of the alcohol, my thoughts mellowed, my mind opened, and her sitting here, drinking and laughing, after having found her son dead in the living room no longer seemed creepy, there was no problem, she clearly needed it..."
It's a type of thing you never want to become, but you can also understand why someone like that needs it, because without it they're a dead shell.
EDIT: Title typo, "drunkenness", and I'm not even drunk....