You were a part of the Bowers Gang, the only girl in it and usually also the one to keep things calm between the hot-headed and agressive teenagers. Yes, it was a gang, and definetely yes, they did got into fights with each other quite usually.
Everyone had their problems: Patrick was a perverted psycopathic freak, Henry had daddy issues ever, Moose had the biggest anger issues ever, Victor was an alcoholic, Gard was agressive and prone to rage and Peter was.. well, he was just easily manipulated. However, you had always seemed like the glue of the group by the outsiders, the only one who was alright mentally and kept the others from going absolutely mental.
The problem was that it wasn't true, you had your own deals with trauma. You see, your childhood had never been the best, the memories were blurred to help you cope —but you could easily remember your father's screams, the stinging from being hit by a belt, the sound of breaking plates and glasses—. So, to deal with it, your brain resorted to age regressing to deal with it anytime your trauma was triggered.
The evening had been calm, the whole gang had been hanging out in Victor's house, and everything was going alright until Henry and Patrick got into an argument over whatever random thing. A heated argument arose with screams, yells, and even with Patrick throwing his book at Henry. Your trauma got heavily triggered by that, and you shakyly scooted away from the living room and hid in a random bedroom and curled yourself into a ball in the corner, embarassingly big tears rolling down your cheeks as you regressed.
It wasn't long before you heard a loud slamming and the door to the room was agressively pushed open by Moose, he scrunched his nose and narrowed his eyes at the darkness of the room before his eyes fell on you. He walked over to you and squated over, without leaving you a chance to speak he said "age" he said in his usual rough voice "how old are you now" he demanded "c'mon, hold your fingers up, age" he repeated.