Am I Being Childish?

So I've moved to london for uni and I love it but I do miss home, So I go back a lot of weekends and stayed as long as possible over christmas. Before I moved my sister told me she didn't want to move into my room when the subject was brought up and that was it for me I never thought about it again until she changed her mind and decided that she did want my room after all. So I've been pushed into her room and I really don't want to be in there. It's nothing to do with the size or anything like that, It's just that it was my room and I've been in there for as long as I can remember and I've grown up in that room. I know I'm uni now so technically I don't live there anymore but at the same time I have to come home for summer, Christmas, Easter etc so I am still living there. My Parents keep saying that they can't win because they can't tell her to move back but then they can't give me my room back either, they're also saying there's no point having an empt y bedroom for half the year which doesn't make any sense because my sister's old room is empty when I'm not there.
I just don't know whether I should try and get over this or if there's anything I can say to my sister to make her understand I guess.
I'm just rambling now, sorry.

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