Do I have the right to be annoyed?

So basically, i'm currently still living with my parents. I pay them rent , I buy food shopping and clean around the house, work and study. My younger sister who is also an adult, never cleans, doesn't pay them rent, she works roughly the same hours as me and so whenever I say to my parents that this is... show more So basically, i'm currently still living with my parents. I pay them rent , I buy food shopping and clean around the house, work and study. My younger sister who is also an adult, never cleans, doesn't pay them rent, she works roughly the same hours as me and so whenever I say to my parents that this is unfair, they just tell me it's the way it is. It is annoying me the fact that whenever I tell them how i feel, they just ignore me and saying i'm being rude. It's like they can't understand why i'm annoyed. They tell me to move out but atm can't afford too. Do you think I have the right to be annoyed as I think I am being treated differently?
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