Here's a compelling article from Marie Forleo. It's called The Secret to Getting Paid: Knowing Your Worth & Overcoming Shame.
In it, Marie gives us some interesting insights. Here’s one that’s particularly thought-provoking:
When you trust the value that you offer, the outside world will take notice. Even better, you’ll stop settling for less and start asking for (and getting) more.
Have a look at the complete article for more of the Marie's uplifting message.