I tend to be quiet around new people but then I feel like I've already "branded" myself as the quiet one and when I get comfortable enough to have a conversation, i might still not talk because now it feels like too big of a jump from not talking to talking a lot.

Usually with alcohol I can skip the analyzing step but then there might be a point when I get overwhelmed and I'll just zone out, as if I'm just observing the conversation like a ghost or a fly in the wall.