Does your brain freeze when your boss watches you while you learn new tasks?

I find I create what I fear (of looking stupid) whenever my boss sits with me while teaching me something new, as I get nervous and make all kinds of mistakes. Any tips on how to become more thick skinned at work? Like joining team sports, or putting myself in other environments that would help toughen me up and be more confident at work?

Does your brain freeze when your boss watches you while you learn new tasks?
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