You better make it count, cause you can't get it back

What do you do when you really realize life is too short? That at any moment, it could just be taken away from you just like that. Why? Why do you never realize how important living life is until something tragic happens?

My cousin was killed yesterday morning; he was one month younger than me. That's not the way life is supposed to go; but whoever said it was supposed to go as planned?