On my way to my dream job, but I'm miserable

So I recently started a new job, I've finally got myself on the career ladder that I want to be on, and I'm fucking miserable. I feel constantly out of my depth, worried about doing stuff wrong and I'm nervous all the time at work. My boss has told me that I keep messing up because I'm nervous, and they seem really genuinely pissed off about it, I'm not sure how to make the situation better because I just can't relax (there's just so much riding on it)

Any advice?

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