I get that, but agree with
@kiki that it gets easy very quickly. I grab a spot at the bar and say hello and something small-talk-ish to the bartender, then strike a sort of balance between browsing on my phone and remaining open to conversation if others want to chat. I like being old in this situation: there's no pick-up-y subtext to anything, and I don't give a **** what anyone thinks about me sitting at the bar alone.
True fact: We have a massive gym/health center at school that is often empty after hours; I like to go in and listen to music and shoot free throws. The Athletic director frowns on people using the gym alone. Here's our standard convo:
AD: "Don't use the gym alone, it's dangerous."
Me: "I
live alone. If I die in the gym, at least my cat won't eat me."