Maybe it's about people who are disabled that were born that way ("we come into this world unknown"). They suffer their disabilities in silence so the rest of the world won't know that they're suffering. Kelly tells them that they have to stick together and rise above the hatred society spews at them. She's basically saying what we've been told as children that everyone is different in some way. If we were all the same like the narrow-minded people want, the world would be boring. ("We are all misfits living in a world on fire").
Maybe it's about people who are disabled that were born that way ("we come into this world unknown"). They suffer their disabilities in silence so the rest of the world won't know that they're suffering. Kelly tells them that they have to stick together and rise above the hatred society spews at them. She's basically saying what we've been told as children that everyone is different in some way. If we were all the same like the narrow-minded people want, the world would be boring. ("We are all misfits living in a world on fire").