I relate very much to Pipefish's experience as far as coming to terms with my lack of finesse in the area of public speaking. I'm just not that great a speaker.
And that's ok, because I have other talents. Writing is one of them.
That aside, I did notice that once I got and stayed sober my general level of anxiety greatly diminished. I've been able to speak quite comfortably in groups of people for the first time in my adult life. That's a good feeling. I'm still not totally comfortable with it, and that's ok.
Maybe you will eventually find some peace with your speaking abilities and level of comfort.