And what if she feels the same way about you, but you're both too afraid to ever say anything about it? I don't agree it's right or fair, but it is still quite common for women to wait for a man to make the first move. If she is your friend, she won't be angry. At worst, it will be a little awkward a few days if she doesn't feel as strongly about you and tells you so, but some of the best relationships grow from friendships.
Seriously, these are your own inner insecurities speaking. I really think you should seek professional help to understand why you feel this way and to help you gain confidence. Were you teased a lot as a kid, perhaps? Things like that can be hard to get over and to accept that adults are not children. A psychologist can help you sort through those issues. It's way more than we can help you with over the internet.