Is She Really Shy or am I does she just think I’m creepy? What should I do.

There’s a girl I see everyday in the hallway and I catch her staring at me all the time she looks away right away. been going on for about a month now, I think she’s pretty. I’ve never talked to her btw. I added her on Snapchat and she left me on delivered. Literally delivered. For a week now. What the fuck What do I do

Edit: sorry about typo in title