My differences between me and my sister?

Hello, I'm a very outgoing person, attractive (as I was told,) and fun to talk to (as I told told again.) My sister, on the other hand, is pale, rude (a lot of my friends commented not that one,) not really attractive (compared to me,) and thin and frail. Apparently girls despise me. When we were at a family reunion, we were both in a shop, looking at cute stuffed animals and other interesting things. My sister was looking at little snow globes (I was right next to her) when a girl (my age) came up to us and started talking to her. (I was in the middle of them) She was talking about snow globes and stuff. I chimed in, trying to talk to her, too, just shooting the stuff, trying to be nice. She shot a few looks at me, flipped her hair, and turned around, elbowing me, not even apoligizing. “Excuse me, I'd think it would be nice it you said sorry.” I said to her. She crossed her arms and said, “Whatever. Stop ing into my conversations anyway.” he said and walked off. Someone please tell me if she envys me? It's been like this my whole life, girls are rude to me, but seem to like my sister. Help, please! Thanks!