So sick and tired of her shit.

I'm so sick and tired of my fiancés daughter, sad to say. I've tried everything to get along with her, have taken everyone's advice and I get nothing from her. She hates her mom so why would she even want to be friends with me? She adores her dad and is very over protective over him. So I can understand where she is coming from. She also is a teenager (16) and her hormones are all over the place. I'm also younger than my fiancé, he is 35 and I think that's an issue for her. Again, I understand all these things but she doenst try to get along which only makes the atmosphere in our home awkward. And she knows this. She's rude to me, even when I'm nice to her. For example, yesterday we went to our friends house to watch the fight. She was standing up so I asked if she wanted to sit down and she looked me right in the eyes and said "I am" almost like she wants to kill me. Her face says it all. She doesn't talk to me, just walks past me. She's rude to her brother too. She only gets along with her dad. At this point, i have given up. She seriously puts me in a bad mood when shes here. I don't hate the child but I defiantly don't feel comfortable in my own home when she's here. She walks like she owns the place. If I tell her something, she has an attitude about it. I'm so over it. Our cat sleeps in her room so I knocked in her room a few minutes ago, she opens the door and I ask if I can put the cat in her room as I'm holding the cat. She says "put her on the floor" so I did and she closed the door. She's just such a bitch. And I'm sick of being nice and staying quiet each time she's rude to me. I really need some guidance or advice, because i am about to break down. I can't talk to my fiancé about

Ir because all he will say is he's sorry and that she's like that with everyone else too.