I hate to come across as an asshole, but get used to it. Seriously. I can guarantee you'll see a lot more people die by the time you croak.

I've had at least one friend, classmate, or family member die every year since my junior year in high school. Jars of Clay got it right- "Colder still is the heart made of stone, turned from clay, and if you follow me you'll see all the black, all the white fade to grey." You stop caring pretty quickly.