Sort of off topic, but on "yolo..."

I don't get it. You only live once, right? So why be stupid.

Exact conversation I had with a coworker:
Him "I know cocaine is really bad for you, but it sounds awesome, so YOLO."
Me "... I quit doing ecstasy cause YOLO."

I feel so damn old every time I hear it. And I'm only 20. Every stupid thing I did in highschool was done with a "**** it" attitude, but I always had that nagging feeling in the back of my mind that "This is the only life i get, why am I doing this?"