I want to say that it mean many things: Though she loves to use her voice, she feels insecure to. I think this because, as she goes on, she tells the readers about her teeth gap, and how she loved her voice, and how others loved it too. Maybe then she feels restricted from living the lives of others, but it would feel more normal to not have a gap in her teeth than speak.
Working with autistic children will be a lot different than working with atypical kids. Autistic children need more help and attention and love than normal children.
