If you only think about her when you are bored, I'd say it is probably just a crush that you'll get over soon enough. It's when you think about people all the time you'll probably want a bit more advice. If you are feeling lonely, get out and about - there's bound to be some hobby or club that'll grab your interest.
You need to go out and widen your social circle. Get in with a group of friends, find someone you really feel something for and then not wait too long to ask if she'd like to spend time with you. The worst thing to do is develop feelings for someone and just stick there feeling bad about it. Go on dates when your interest isn't already at max and it doesn't mean the end of the world if they're not interested.
If this is serious.......
Is she available and remotely interested in you?
Would you tell her your feelings?
You say you talk to her a lot, how do you know her?
If you cant stop thinking about her you need to know how she feels or you will just be stuck in limbo.
Even if she doesnt like you back, the feelings will pass eventually, trust me!