Fake it till you make it American spoken language positive
It can also be phrased as "fake it until you make it".
If you behave like the person you want to become, you'll become like this in reality.
If you want to get more work done, act as if you are a productive person. Fake it till you make it.
You should start talking to people like a confident person as it is a good way to boost your confidence. Fake it till you make it.
The phrase is first attested some time before 1973. The earliest direct reference is a Simon & Garfunkel song “Fakin’ It” released in 1968 as a single and also on their Bookends album. There Simon sings “And I know I'm fakin' it, I'm not really makin' it.” (Source: wikipedia)