Yesterday, I had a dream that I was dead, and then I sat on my grave. My parents went to burn paper for me and cried bitterly. I saw my parents crying, too.

Oh, that's not a good sign. You should relax and not be too depressed, often because it is a little big, but from a religious point of view, it is really not a good thing. Not really. Don't worry about it. When you have time, go to the temple to burn incense and pray devoutly. Don't feel useless, but it is really useful. Maybe it's yin. It is better to worship Buddha and burn incense.