If you're a writer who feels uncomfortable about public speaking I suggest you read about the Stanislavski method of acting. The basic idea is that the audience sees what the actor is thinking and feeling, so actors need to think and feel what their characters would.
When I speak to groups I don't worry about what they will think of me, but concentrate on how I can meet their needs and best communicate the information in my notes. Sharing that way is fun and certainly not scary. Try it; You may like it.