I understand this, but it's never too late to teach yourself new things. If you're expecting her to act a different way then you have to meet her in the middle.
Girls are not really known for rationality. She is probably insecure, or maybe she is new to this whole thing. Either way, she is feeling threatened by something and thinks she is not good enough. You can either talk to her and put her mind at ease or you can decide it is not working.
You don't have to talk during. You can talk after. Or before. Girls can often surprise you, and if you've never told her that you think she's the moon and stars and better than others girls then she might just be thinking you want something more than what she is giving.