Why does my sister think I am so self centered and I always victimize myself?

when some people are miserable, they drag everyone down and try to make them just as miserable as they are. sounds like shes doing that to you. if youre living with her, this seems hard to avoid. shes only calling you self centered because she is the one with the problems and the center of everyones attention, so by blaming you, it makes her feel better. dont believe it for one second! try to stay positive in a negative situation. i know it is hard. maybe you can start hiding your stuff or locking your door if possible. i know parents sometimes dont always listen, but if you can talk to them, try that. ive been in this situation, and it got better when i moved out. good luck to you.