Relationship advice???

Okay so there's this really cool girl who goes to my school but we almost never get the chance to talk

I went to a movie with some friends I'm half affiliated with if that makes any sense and I saw her there. And I was to nervous to actually start the conversation but after the movie (fnaf 2) she started talking about how excited she was about the next movie. Ive only seen the movie so it was hard to understand but as she was describing what she'd hoped to see she talked so confidently.

She even pointed out my necklace but she started talking again before I could even say thank you and I thought that was cool

The thing is we're "friends by affiliation" so we don't know too much about each other and I'm pretty sure she doesn't even know my name, we've only really talked twice so I feel guilty for even liking her. Like why do I even like her I shouldn't like her we've talked functionally twice! 

I used to see her everywhere in the halls but she's disappeared and might've gone virtual.

It really doesn't help that I've had 2 separate dreams where she bites me for some reason???? I feel so guilty

I'm not very masculine and I'm more. For lack of a better term "femboy leaning" on the spectrum but I know most people don't like that

Any advice would help.