Why do teen guys stare at you?

Well there could be three reason why a girl is staring at you.

One. She likes you. Girls like it when guys talk with their eyes. Like, you see her walking by on the bus, and she stairs at you. She's saying "hey, I like you" or "hey, I'm interested".

Two. This girl wants you to look. She wants your attention. Why someone is looking at you, you can feel it, correct? Well she desperately wants you to look at her. She wants you to focus on her.

Three. There is something seriously wrong with your appearance or she's curious about something. But it is rarely this one.

Hope this helps!