As someone with clinical depression, I've had to deal with the same thoughts since I was 8. It's not something you can just answer to yourself about, it takes time, but what it all comes down to, is a choice. Yes, that's how I believe the end is for us as well. Don't expect a grand religious rant from me. The choice we have to make is in how we're going to deal with it. Are you done or are you going to do something with the life you have?
It took years to come to a realisation that I want to make something of it and just as long to actually believe in it. This is what we have and it could all end tomorrow, so what are you going to do? Wallow and feel sorry for yourself, or try to leave your mark, make the world a better place, or more realistically, just make life better for those you're going to leave behind. Enjoy it, Appreciate it, Endure it.
If I'm wrong about our fate, fan-fucking-tastic, if I'm right, I'm prepared to fight it out til the bitter end. That's the choice I've made. I'm going to live my life, I'm going to do my best and I'm not going quietly.
"Through nature's inflexible grace, I'm learning to live"