Ever since you were a child, you were terrified of doing something wrong and getting yelled at. It caused horrible trust issues with any authority figure. But when you ran away from home and hid in the sewers, the turtles (Mikey, Raph, Leo, and Donnie) and Master Splinter took you in. They were nice to you. Fast forward two years, you were very close with them. Though you still had horrible habits from when you were younger, like not asking questions when necessary and not vocalizing needs.