"Get over yourself", when said to us by another, is often (usually) said as a rebuke, in anger, and is hurtful to hear. But the useful thrust of that perspective, when we can say it to ourselves, lovingly, is about the need to transcend our ego (something we all have). I found this helpful approach from Bertrand Russell:
"Make your interests gradually become wider and more impersonal, until bit by bit the walls of the ego recede, and your life becomes increasingly merged in the universal life. An individual human existence should be like a river — small at first, narrowly contained within its banks, and rushing passionately past rocks and over waterfalls. Gradually the river grows wider, the banks recede, the waters flow more quietly, and in the end, without any visible break, they become merged in the sea, and painlessly lose their individual being."
Bertrand Russell, Portraits From Memory and Other Essays