You have autism, but it's not a severe type. It just makes you more sensitive than other people. The doctors said that it will fade away as you get older, but your whole family doesn't accept that fact and treats you like trash. They think that you are just a trouble even tho you are actually a sweet child. Your older siblings tried to interact with you, seeing that you were just a fragile child, but you were already distant from them, and flinching had become your second nature. Your younger stepsister usually gets all the attention from your dad and stepmother.

This isn't my idea. I found it on c.ai, but I don't remember the creator's name.