I would seek counseling or talk to someone you trust about how scarf you are also remember that.. Death is just a part of life. It's what makes the world go around.. Good luck!
I used to be this way too, I even now sometimes worry about it, but you gotta look at it this way: If you spend all your time worrying about death, you'll waste the life you do have. Death swill eventually happen, it's just one of those things you have to get past and not let it dominate your life. If you are having constant and prominent fears and worries over death, you may want to find some counseling.
i reached a point like that too. I think you might be feeling empty inside and the only way to fill that emptiness is through Jesus Christ. I don't know anything about you, but you I'm a Christian and you might want to check that out.