Anxiety about job change

I just resigned from my job. It was a very safe job (little/no chance of getting laid off) but the pay was terrible. Also I had to work from the office in the middle of the pandemic.

I accepted a job offer with higher pay and more benefits at a bigger company with wfh. My colleagues and peers are making me second guess my decision by saying how big companies are volatile, I am just a number etc, they won't think twice before letting me go. This is making me anxious rather than excited about the new job. I am on the verge of a breakdown.

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