I remember my school years and feeling exactly like this. I also had a friend who was very similar to Aya! She was a very "girly" girl, outgoing and cute, and so easy to talk to! (Also, she was a really good person, we are still very close ) She did try her best to make me a part of her group of friends, but i just didn't fit in. They were nice people, but i was really lacking in the social skills department lol
My point is... she isn't being a pick me. Sometimes you just feel overwhelmed, specially if you are the quiet type. It's a feeling like ... like when someone tells a joke and everyone laughs but you didn't get it. Seeing all of these people who talk to each other so easily without any effort, can make you feel like an outsider. But it's alright!, I mean... you can't expect an introvert to suddenly be besties with everyone