Dr. K helped me with this, but I'm no master (far from it, actually, I'm still very socially awkward), so I'd recommend watching his stuff, the guy is phenomenal imo
but taking baby steps and accepting you won't be good at something you just began doing (talking about random stuff, in this case) are 2 major steps in doing something new/something you're uncomfortable with.
don't feel useless because you aren't succeeding, but thankful that you are having a chance to try, becoming better is a matter of time, but you'll suck for a while and that's ok