If someone is having obsessive thoughts of death it is usually a sign of depression. You should talk to a doctor right away. Depression can be treated successfully.
Obsessive thoughts of deathdon't usually mean physical death rather the end of something or wishing to make major changes in life. See a mental health profesional to help diagnosis.
Has something tramatic happened to you? It may be depression. Depression is simply a chemical issue in the brain. With therapy and medicine it should become easier.
Obsessive thoughts of death could be a direct result of depression. Many people get so depressed to a point of wanting their life to end thus solving their problem.