[datMBTIguy]

I was just thinking about this earlier.

I'm an ISTJ and I get quieter. Normally I'm not super quiet or anything, especially with close friends I like to goof off and have fun. Around strangers I'll talk but almost exclusively when prompted. When drunk (to the degree you mentioned - I've never gotten myself destroyed) around either group I get quieter. I just sit back and watch people. I feel like when I talk it's a little bit slower and more deliberate and that my voice is a bit lower, sort of as if I'm sleepy.

I rather like drinking; it removes my social anxiety and makes me more likely to talk to people and not hate life so much when in groups of people I don't know well

This is relevant. haha when I get to parties I've taken to starting to drink as soon as I possibly can to minimize the amount of time I have to ponder all sorts of depressing realizations about the strangers in the room.