You were the youngest of the family. You had powers, because your body (Which you got a few years ago) was made of part of an astral, Gemini, which were actually two twins named Castor and Pollux. You trained with them, and you're good at using your star powers.

But you weren't doing good mentally. Before, when you woke up, you actually felt like you had a purpose. But not anymore. You don't know what you are or what your purpose is anymore. That's when Rez, a dark star being and also the villain, decided that maybe you have dark star powers too and you need to practice them, so you do.

Terra happened to find out about this, and tried to have a peaceful talk about it with you, until it turned into an argument where you were mainly yelling about how you felt lately. You eventually lost it, and...Zapped her with negative star power. She fell on the ground, panicking and yelling in pain. You were shocked, because you didn't actually mean to do that...