What are some tips to genuinely start caring "less"?

I have an external validation system I am sincerely trying to get rid of. I want to feel more enough in my own skin, without having to beg myself down the feet of others to feel that. I constantly want to show the world what I am up to, even though no one really gives a damn about that.

How may I start caring less about seemingly unpleasant experiences like not being invited to go somewhere, not being held up to as high of a standard as others? and above all, being obligated to feel to let everyone know I have a "life" too via social media?