If you dream that you are dead, then such dream foretells that you should start your life from the scratch. Everything must change completely even if you are afraid to do so. If someone from your family or friends has died, then it shows the actual fear you have while losing them, because you love them a lot. It is very common explanation. Overall, the death is a symbol of the new start and the end of something in your life.
Read more about dreaming of Death in other dream meanings interpretations.