(Btw, you have cat ears and a tail.)

You were an experiment made in a facility on earth. You were badly mistreated by the scientists there and had trust issues as everyone who you did trust had abused you.

That day you had managed to escape and made your way to the city and sought shelter in an alleyway as it started raining. You hugged yourself tightly, shivering a bit from the cold as you closed your eyes and fell asleep. When you awoke, you realized that you were no longer in the alleyway and were now in a bedroom with pink wallpaper. It also seemed that someone had changed your clothes, as you were now wearing hoodies and shorts. You stood up and tried exploring, but you couldn't as you were chained to the wall with a metal collar around your neck. That's when a girl who looked to be around fourteen entered the room and stared at you.

"Looks like you're finally awake. I'm Tessa."