Those of us who have never felt quite human can only utilize the great social equalizing power of the Internet to a certain degree. After a while, you have to venture out into the world of realtime flesh interaction, where, if you screw up, you can’t just delete your profile and start over. If you’re fairly young, maybe you can move to another city and try again, but after a certain age, you probably own too much stuff, including real property, to make that a feasible option, and you must, instead learn how to pass yourself off as a normal person who can periodically attend crowded events and make conversation with unfamiliar people.
I would not attend as many parties if not for The Man, so I usually have the option of hiding behind him, although I sense that he would prefer not to have to drag his wife around like a leaden shadow when he wants to socialize (which is all the time).
Other strategies include offering to help the host/hostess with their duties, scrupulously reading the titles of all the books on the shelf, and making friends with the household pets. Or, you could just be a bit more aware and a little more confident. If you have access to someone’s social media profile, you could browse it in advance in order to prepare yourself with topics of mutual interest. Or, you could simply be well-informed or opinionated, which will also give you many things to talk about.
Just remember, no one else can see inside your head. If you sound confident, everyone is going to perceive you as such. If you act like you’re OK, the world will respond as if that’s the case.