I never heard of a speaking requirement to collect your one year coin; a symbol to the rest of the group that the program works!! You've earned the coin through your continuous sober time.
As far as public speaking, are you referring to be the main speaker at a speaker meeting, or just briefly sharing at an open meeting? Remember you aren't doing a public 5th step, that's not necessary. It's just "what it used to be like, what happened, and what it's like now." You shouldn't feel compelled to share anything you are uncomfortable sharing. Ask God to "put the love in my heart and the words in my mouth." And use you to say something someone else needs to hear!!