I dreamed that I saw my own grave.

Graves and coffins generally imply what dreamers give up in real life, but I don't know what you need to give up. Now that the grave is empty, it means that you are not sure whether to give it up or not. Your family built a grave for you, which means that you have something that you don't agree with your family, and you want to keep it, but your family wants you to give it up. You estimate that you are going to die, which shows that you have no idea about what you are clinging to now. I have a hunch that you cannot escape the fate arranged by your family. When you go to A, it means that you hope to find someone to support you in this matter. Some people have this intention in real life, but you are not optimistic about the future. The second half of the dream is a sign that the dream is about to wake up. So I can't see much. It can probably be seen that your attitude towards this matter is not optimistic (down the mountain road). Maybe things are still going according to your family's intentions.