I have a few questions about submitting short stories to literary magazines:

1) When they request a bio, what should I say? I'm previously unpublished, and a 14-year-old student -- thus, no work experience. What should I write, a list of hobbies? My story is about a girl killing a centipede to stop its suffering. Is the line "as a child, I spent my time squashing centipedes for far less honorable reasons" alright?

2) Since my story is so short, is a short query-like summary needed?

3) If the guidelines said nothing about bios, should I include one?