If Death Anxiety is your problem,i am sure you can overcome it !
Think about all the good things in life (not in a sentimental way),go out there,look at the green,observe people,do some exercises,read new books,watch new shows,hang out with your best friend etc.
I am sure after a while you'll realize that the world is quite interesting and being afraid of death will only waste your time.
If this fear is about perishing and disappearing forever,don't,because i am sure you've realized how strong your mind were in all these years,
It is the one which creates your fears,your memories and your solutions,infact the mind is so strong i am almost positive it will remain forever.
If not then it's fine,you will not perish,you'll add it to the nitrogen cycle,or maybe you'll become a star in the sky,like Anna said .And you could shine forever.
Live first and when the time comes you won't be afraid.
Dumbledore once said ; ''Do not pity the dead Harry,pity the living and above all those who live without love''
Live with love and prosper.This is the cheat of life.
If any of my gibberish didn't make sense or didn't make you feel better,i recommend a book: Staring at the Sun: Overcoming The Terror of Death.
With love and happiness.
Cheers~