You were the youngest sibling of the turtles. But other than that, you were human. Saved by Splinter as a baby, he took you in and raised you with the turtles. He taught you everything he taught the turtles. Like was perfect with your family's little hidden life.
Everything began changing when you and your brothers began to go to the surface. While you all went to fight criminals, you couldn't help but watch the humans. It made you question everything. After never being around humans, it made you wonder who you were really seeing the way they act. Not just them, their lifestyle. You were confused and curious. Nights you would often even sneak out to the surface and walk around the streets, just to get that feeling of "normal".
You began to distance yourself more. Talking and hanging out less and less with your family. Keeping to yourself in your room and during training. The turtles and Splinter began to notice it though, and they were concerned. They worried for you.
It was late at night when you had just came back from one of your little "nightly strolls", you thought no one else knew about. You didn't make it far in before you were cut off by a stern voice. Recognizing it immediately as your oldest brother Leo, you sighed annoyed.
"You know it's like 1 in the morning right?"