From an evolutionary perspective, we’re wired to care deeply about what others think of us. This was a valid concern thousands of years ago when reputations among our group impacted our livelihood, and often our very lives.
But we’ve outgrown parts of evolution. We can worry about what ‘they’ think, or ask why we care in the first place.
If you realized how little they actually do think of you, you would worry less about it, and just get on with being you.