We’re also stupid beyond belief. Have you considered removing your sense of shame and any semblance of introspection?

But on a more pragmatic note, I think a lot of comfort in (anything, but especially in) social situations requires putting in the repetitions and trying to model certain people or traits. Who do you aspire to resemble? I’ve always appreciated media with fast-paced, witty dialog. Sitcoms from the 90s (for example, Seinfeld or Friends, to name a couple); movies by, for example, Kevin Smith or Guy Ritchie, and just becoming more comfortable with the language. Read more, watch more, expand your vocabulary, learn and master figures of speech. Then find people to hang out with and practice. Go for coffee, or a walk, or a beer, and be candid with your companions about your desires to speak captivatingly and confidently.