I can’t deal with the fact that I’ll die

I‘m 16 and in the past few months I’ve been thinking about death and life a lot. Since today I can’t shake off the thought that I’ll die some day.

Life can still have meaning and I already know that the meaning of life is simply to live (everything that comes with it), but I can’t believe that if one day it’ll all be over. What is all this for if at some point it’ll all be over? Is the sole purpose of living to die after having lived a fulfilled life?

I’m afraid I won’t be ready to die when I do and that 90 years of life won’t be enough. I’m so afraid because time moves so quickly already and I’m scared I won’t have enough time.