Flirting

A girl looks at me but doesn't look away. What would this mean?

So i noticed this girl was staring at me. When i looked over and i saw she was staring at me. We made eye contact for about two seconds and i looked away because I'm pretty shy around and inexperienced when it comes (I've never had a girlfriend). The staring happened almost every day last week but it only happens in class. It doesn't happen in in the hallway or at lunch, she has no eye contact with me except during this one class. We've never really talked and we don't really know each other except for that we friends on facebook. There's no other guys around where i sit and there's nothing behind me that would be interesting to look at. I doubt that she's looking at me for my looks because I'm not the most attractive guy but I'm not ugly.

Is there something wrong with the me?
Could she think that I'm cute?
Or maybe she was told that i was looking at her?
Or am i just over thinking this?

A girl looks at me but doesn't look away. What would this mean?
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