You have to drink to ease out the tension and insecurity. You have to pretend you actually listen and understand their stories when the music is too loud to even hear yourself think or you're not that interested. You have to make eyes contact, give kisses, and drink again till your guts out and start doing something stupid.
Most people will feel alienated at some point. If you're among an astronaut among the aliens, you are the alien. Then if everyone feels like that all the time, Earth will become a brothel filled will pitiful creature who designated to be abandoned and have no other planet to return to in this vast and empty galaxy