Death

Am I suicidal if I think of death at least once a week? Am I selfish for wanting to leave this world, because I just do not see myself succeeding in the future? I cannot imagine myself settling down with a husband and a career and being expected to have children. I thought I could stay young forever. I thought I would not have these responsibilities. I have so many people that I need to make proud of. Is it depression if I am really sad once in a while?