How do you get past the imposter syndrome, and finally feel like you're good at your job?

I landed a contract role A month ago at a Fortune 500 for a data analyst of BI and data science. Our department is literally a data science division, so there are people here that have PhDs, and machine learning engineers, all that jazz. It's extremely technical, and I literally feel like I don't know what I'm doing half the time. There's no confluence, No documentation, I asked for a data dictionary and the manager laughed at me saying you …

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