Star Power

Fat. Ugly. Stupid. At her high school, Jeanette is the target of every insult and the butt of every joke. But when she finds a magical artifact in the old junkyard, she knows this is her chance to be more. Behind her superheroine mask, she saves lives and takes on supervillains. She even has friends. as long as she never lets them see under her mask. But it will take more than superpowers to teach her to know her own worth. This short story is 9800 words long.
It is also available in The Fire Inside, a fantasy short story collection.