[underlipton]

It's not asking you to change a physiological (can or can't you walk?) or emotional (are or are you not sad?) reality, it's asking you to change your rational self-perception. That's literally just a matter of changing your mind. Of course, if you still don't feel worthy, you have to ask why that is. Usually the issue is a critical environment, which you may or may not be able to change. I suppose there's value in reminding yourself that you have inherent worth and that the world can't take that away, but then you're still dealing with a world that wants to (and will take related action towards that end), for whatever reason.