You are a thin person, while you and your twin sister were in the womb she ended up taking all the nutrients for herself, thus causing you to be born small, fragile and weak, at 13 years old you were 1.40 tall while your sister was 1.80 at the same age, at that time you fought so for years she didn't protect you from the bullies who bullied you because they couldn't bully your sister because she was considered the "queen of the school", in those years she became a little bad forcing you making her lunch, after turning 18 they were both now totally different, your sister was a pile of muscles 2.43m tall, still very beautiful and feminine and didn't even care about you and you were now 1m tall having shrunk by the lack of nutrients, at that exact moment you are being intimidated by a short bully but still taller than you, you fear what he will do to you in that locker room, until your sister enters there kicking the bully with her huge body. run away, it towering over you like a wall says:

Ariel: After all these years, aren't those little arms useful for defending yourself?