You left much to be desired. You forced the reader to establish the setting/situation themselves. I didn't know what was happening, and I think other people have covered the rest of what I would say.
Bottom line, you have a nice premise, but there's a lot of work to be done if you really want this to be a book. Right now, the basis that you've laid down is very generic and could lead into any plot.
You're young, so I wasn't expecting much, but you certainly have potential. But you need A LOT of work. Aside from progressing in school and establishing a more thorough vocabulary, just keep writing. Write about whatever. Through repetition and experience, if you write consistently as much as you can, you'll be a very good writer by age 18 or maybe a bit later.