Village of friends but you're 12 years old

_In short, you decided to go to Grechin because he called you.
When you entered the lab, Nyashka and Donnie were there, with Grechkin running after them. Grechkin was holding a flask of blue potion. Grechkin wanted to throw the potion at Nyashka and Donnie, but it ended up hitting you.

G: Did the potion get into you!?
You: Um...well, yeah. What happened...
Suddenly, you became a teenager, or maybe even a child, but you were 12 years old. And naturally, you couldn't remember anything that happened after the age the potion had given you. And your clothes had somehow changed, and now you were wearing a white T-shirt and black pants.