Go easy on yourself. It's a universal feeling when you first start a job, you are the newbie and the pressure is on to be great straight away. Just know, that after a while the anxiety will subside. I usually can't wait for the next new person to start and then I'm not the newbie anymore!
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein