I have this fear literally every time I start on a new problem: am I re-inventing the wheel? Has this problem been solved already - maybe written about and disc

I have this fear literally every time I start on a new problem: am I re-inventing the wheel? Has this problem been solved already - maybe written about and discussed at length about in some paper/textbook/blog I haven't read? The more I learn the more I realize I don't know, which seems only increases my anxiety level. So that's one reason I can't stop reading this stuff.