Why doesn't she like quiet people even though SHE'S really quiet?

[How]

I have this friend, we always had a lot of classes together...I thought she'd have an amazing life and personality since she's one of those extremely pretty girl...And in class she always had a group of people around her...But then I realized she's actually really quiet, passive, sensitive, and reserved, kinda shy. And she only talks if YOU'RE a outgoing talkative person...

The year I met her I was pretty friendly and talkative I guess which is why she liked me so much...always smiled and waved at me, always wanted to be around me...But then I got quieter....and oh my god whenever we were alone together it was dead silent and awkward...I'd be waiting for her to say something, assuming she was a talkative person...but I usually had to start the conversation...And whenever I'd be like "so why are you so quiet" she'd just smile and shrug...Then try to talk more but she'd seem nervous and unsure of herself...like bouncing her leg, nodding and smiling nervously, etc.

But some days, we would be sitting directly beside each other, working together and she'd be on facebook on her phone instead of talking to me.

We became actual friends by texting and talking on facebook but in person we were quiet, as if we hadn't stayed up all night talking...

I could tell sometimes she'd try to find something to say to me like she'd ask me a seemingly obviously question about the classwork but kinda whisper then lean in really close to me...she'd lean back and stretch on my desk then smile at me, or when she walked into class she'd compliment whatever I was wearing like everyday. And sometimes (she sat in the desk in front of me) she'd had have body turned slightly toward me and she'd smile at me as if she wanted to talk...And sometimes when we worked together even though she was really quiet, she'd be lean really close to me, resting on my desk...

And all of her friends, I notice are all super talkative, exuberant, outgoing, confident...no shy/awkward friends....and when I see her with her friends, she's the quiet one, but her friends open her up a lot because they're so friendly and talkative...

And I noticed on days I'm really quiet, she acts detached and awkward with me...doesn't really talk to me, hardly even looks at me, ignores me, seems really aloof...Why??? BUT on days when I'm confident and talkative she acts really eager to talk to me, smiles at me a lot, keeps conversations going, compliments me, seems so happy to be around me...What should I do? I want us to be good friends...Btw we're both girls, straight...

[Brian]

You're probably over-thinking it. Be a friend and she'll be friendly back. If you try too hard, you'll get nervous and make things awkward.