I am so pissed. I get that I moved out of my parents house but my sisters friend has no fucking…

I am so pissed. I get that I moved out of my parents house but my sisters friend has no fucking right to claim my bed as hers and refuse me my bed when I stay two nights over there. Tough shit you have to sleep on an air mattress for those two nights. I sleep on a futon every night of the week while that bitch sleeps in my bed. I cant stand her. I dont cause any fucking trouble when I visit MY parents. I am not happy at all she had no right she is lucky I am even letting her sleep in my bed.