Hey yeah I'm not the most popular kid in school but I'm not a geek. The girl I want is in one of my classes and I really really like her I don't know what to do how to tell her and I don't know if she even has a boyfriend.:(

It all depends on what sort of a person she is and what she is more likely to respond to.
I mean would a romantic gesture seem geeky to her, would she prefer a funny approach.. are u her type, etc..
Have u actually talked to her?? Does she know u exist? Usually we tend to idealize certain people we have crushes on from far, but once we take a closer look at the real person we suddenly realise it was all just an image we had constructed from our fantasies and mostly just a product of our imagination.

Keep in mind, you are young... what you might think is the girl of your dreams now might become the thing of your worst nightmares in a few years.

Plus at your age, you really don't know what you want yet. That will take years of dating before you do really know. But enjoy dating until then.

Well Like smothe said there will be ma girls and right now you may not know what you want but let's say this is the true girl of your dreams what I woud do is get to know her become friends wit her and her friends this way you will know what she wants in a guy you can find her likes and dislikes this way you can become the guy of her dreams. I don't mean this as change who you are as a person just get to know her if you really think she is the one for you, best of luck ;)