To dream that you die means that you are very afraid of the death, therefore this dream is simply interpreted as the nightmare. Sometimes the dream in which you die could also indicate some phase in your waking life that is no longer important to you. The situation or relationships has come to an end. The dream could also mean that you are working too hard and it makes you feel that you are dying.
Read more about dreaming of Die (You) in other dream meanings interpretations.