I shared a house with three other people once and it was awful. If it was just my boyfriend and I it would have been okay but we had another couple living with us and they were horrible, the guy in particular. He would order everyone to clean up mess that they didn't make, have very, loud, sex with no consideration for anyone else in the house, make fun of my cooking for no reason other than to be mean and he never paid for anything. Multiple times we'd be waiting in line at the grocery store and he'd tell me he left his (empty) wallet at home and I'd need to pay.
Thank god the living arrangements weren't permanent, he wanted it to be though.
It'll be okay. If she's a true friend, then she will listen and she won't get mad. Or, if she does, the anger will pass. Just try to put it in nice words. I wish you the best of luck!
I'm sorry that it's like that, doll. I would suggest that maybe it's time to talk to her. Just be nice about it and say that you would appreciate your privacy. And tell her how much your Skype calls with your boyfriend mean to you. And that you wish that she wouldn't go around sharing your personal business. Or just try to make it work. And, if it gets worse, then have the talk? Sorry, I wish I could provide better advice. But that's all that I could think of.