BLR has a good point.
Another thought is that now days most people kinda take it slow and see if there is eye contact and smiles or interest before they jump in with expressing feelings and asking someone out.
Girls do appreciate honesty and the direct approach but you probably want to get some sign that she is receptive. That way, you won't have your ego bruised if she turns out to not be interested.
If she is shy or if she is just careful about who she goes out with, you don't want to freak her out by coming on too strong too quickly.
Be patient, you will know what is going on if you can just get direct eye contact even once or twice.
I remember when I had a crush on a guy in high school, I used to make sure that I walked down the same hallway every day and pass him so that I could make eye contact. People have to look where they are going and sooner or later they have to look at you if you are walking past them.
