Is it normal that i'm starting to really hate my sister?

Well, my sister is a lesbian (I have no problems with that), and she keeps asking me if I'm lesbian or bisexual (she even asked our mother), and it's getting annoying. She says that I "look like a lesbian" or that I could be one. It's none of her business, either way. Whenever I'm with her, she acts like her girlfriend is more important than me, even though I've stopped her from getting into trouble all our lives, but all she does is take advantage of me. When I walk into her room (sometimes she calls me in to watch a movie with her), she keeps kissing her girlfriend loudly and talking about sex with her (she does this in public, too), and I'm visibly uncomfortable with that (I don't think it's appropriate, even if she was with a boy). I don't even like the fact that I'm trying to get a job being three years younger, and she's not doing anything with her life, and she and her girlfriend eat up all the food in the house, and she complains that my parents don't just hand her money. The worst part is that she claims that my nephew is her son, and that she's pregnant just so her girlfriend can stay. I don't have any hatred towards anyone's sexuality, and I believe that love is love, no matter who you are, but she tells me about their sex (that I can hear in my room), and shows me the toys they use. I feel like it's inappropriate, and It's been hard to be accepting of her.