oh why?

Can anyone explain why these thoughts about aging, dying, death etc. keep constantly running in my mind? Is there a way to control them? It?s so depressing to hear or see something involving the end of existence and there seems to be not much else in the news these days. How am I ever going to deal with the inevitable? I can?t forget I?m doomed to death since I never feel alive?these thoughts are with me no matter what I do, saying ?oh there?s no point in that, soon it will be forgotten?. Will these thoughts disappear with dp? I'd imagine if a healthy person is haunted by morbid thoughts and has for example a near death experience, the thoughts might start to seem what they are, pointless. That movie title ?Eternal sunshine of the spotless mind? sounds so appealing?thanks for any advice.