My experience: I'll be sober 3 years in july, and I have never been good at sharing at meetings. My breath gets trapped in my throat, my face gets hot, my heart beats out of my chest. Know the feeling? It's OK to be shy, its not going to make you drunk.
I tell my sponsees that, yes listen up at meetings, but also to be discerning. Just because someone is really confident and speaks at every single meeting does not mean they have a good message.
I've found my own niche in talking to people after/before the meeting. Newcomers, friends, whoever. It comes naturally.
Maybe you could try being the greeter? That might loosen you up some.
Anyway, I know where your coming from. Its OK!!!
And thank you BARB! for the sponsorship pamphlett thing. A sponsors job is very simple. Too many try to embellish the job with their own agenda...