It is important to remember that we all have our own worth. We all are worth something. But that something needs to be defined. If we do not let others know what our worth is, they will tell us. And no one knows our true worth except ourselves, let alone have our best interests in their minds.
So if you know that you can produce top quality work and that you deserve every dime that you are asking for, have every confidence in yourself and your work. How would you feel when you are/will be fairly compensated for your services rendered? Wouldn’t you be more willing to give it your all? Remember, you are not expensive. You are worth it.