The character 'Little Voice', played by Jane Horrocks in the film Little Voice.
She is very definitely socially phobic. From what I remember, she sits in her room playing old music records, she can barely speak to anyone, and she is just very very timid. Her mother is also very overbearing and doesn't understand it at all. But the girl has a real talent for singing, and the film is sort of about the struggle for her to show her talent on stage, and stuff.