I think this is an ego issue. I had it for a short time. I realized that acceptance is not a zero sum game and ultimately being good ≠ being accepted for various reasons independent of me, eg. at a job interview I may be among the top candidates, but not be the right fit. Furthermore, not being the best doesn't mean being bad etc.

You should ignore/cut out of your life anyone who shames/ridicules you for being rejected.