I dreamed that there were many new people in the company, and several of them were people I knew. Then I came back from a business trip and found my work clothes missing?

According to your description, I think it's nothing. This is caused by your "thinking day and night".

In my analysis, it may be that you are not confident or insecure about your job.

If so, I suggest that you must learn to cultivate your strong heart and enhance your self-confidence. The specific way is to study hard and improve your ability. Then this situation will be much better. Even if you dream again, you won't take dreams seriously.