Why would you not be worthy of her? How do you know she is not interested in you if you haven't let her know how you feel? Also, why would your emotions be invalid? People feel what they feel. And sure, sometimes the other person doesn't feel the same, and then it's time to get over those emotions, but that doesn't mean they aren't valid whilst you're feeling them.
If you really want to get over her, though, it simply takes time, and it helps if you begin looking for someone else who might like you back the same way.