<human>: Provide a brief overview of the text.

I'm 22f and I've never had a very good relationship with my older sister (26) but it's been improving over the past few months or so. However, she continually does this thing where we'll be spending time together and she'll either invite her friends over or they'll invite themselves over, and I end up feeling like the 3rd wheel because her attention gets shifted to them.

When I was a kid I liked being with her and her friends because I thought it was cool to hang out with older teenagers, but now I don't like it so much because I'm too different from them. I brought up the fact that I would rather spend time with her alone than with groups of her friends and it turned into a huge fight between us. She made me seem like a big anti-social bitch and interpreted it as me hating her friends. So now I'm afraid to bring it up even though it majorly bothers me.

Sometimes I don't mind hanging out with her and her friends when she lets me know ahead of time, but I still feel excluded. She's in a sorority so it's always her sorority sisters and they talk about sorority things (parties, personal drama, group politics) and I never feel like I can even be a part of the conversation. When it's with her guy friends they just talk about binge drinking and how drunk they got, and so on. Again, I just sit there like a SAP and text the whole time until I find an opportunity to leave.

Today we were going to watch a movie together and one of her friends shows up to bring her food, but he ended up staying. They were just talking so I just stopped the movie. Then her friend wanted to go out and do something even though we were already obviously doing something. They invited me along but I declined because if I went then I'd just feel like a SAP the entire time.
<bot>: my sister always invites someone else along during our bonding time and I don't know how to get her to stop without making her angry.