(Athiests only) How do you cope with the fact that dying means THE END?

For me, accepting the reality of my brain "powering-down" is freeing. I know my memories are stored chemically and when those chemicals and structures succumb to entropy what remains are others' memories of me. I focus on making a lot of happy ones with those around me. I don't spend time worrying that I'm not immortal because that just isn't the way the world is. Focus on the positive :)