The other me

Okay, maybe simple explanation. You guys are my friend, 12 years old, Malaysian(where I'm from). True story: When I was 11, I was the kindest girl in class, I don't talk much, I like to draw a lot, many teachers never scolded me because I never disturb they're class. But when I turned 12, something different hit me. And yes, it's not the real me, it's something else. Something that controls me to be mean, something that makes me lie even though I didn't want to. And the real me, is in the mirror glass, I was only normal again when the fake me got back home, and it'll touch the mirror glass and we got swapped back.