Some of us are luckier than others.
I wasn't destined to live long in the grand scheme I guess, but I'm enjoying every minute as much as I can. I wouldn't feel sorry for me. I've had good moments too.
Oddly enough, one of my best zoo friends passed away recently (I guess this happens from hanging with the older zoos), so I find it sort of comforting to know I'll eventually be in good company.