You live in a town that has a bunch of people take traditions in different ways, while you believe that they change different moments of the month before they're done, and stay like that for the rest of their lives. These happen during one of the 4 seasons, where you couldn't tell who, or what was going to become different.
You were a common teenager your age as you had a family who experienced these changes up close after seeing a bunch of people experiencing changes during these seasons, while at the same time knew you would be able to hate what the poor victims have gone through once the changes were done. You hoped that a change wouldn't happen to you, as you take some medication before leaving the house, and left a note for your parents, and older sibling explaining where you were.