Um...
Purpose- only if you give it one. Life by it's own virtue has no purpose because you're not
obligated to do a darned thing with your life. You could just spend your time eating, pooping and sleeping and not making a single contribution to society and still have lived your life fully in your eyes. It's sort of like beauty- it's in the eye of the beholder. I personally feel my life has purpose, but I don't impose a purpose on others. It's really up to you to decide.
I see life as something to be savored and enjoyed. My consciousness is mine alone, and I want to live as though I'll only live once.
I don't know if there's an afterlife. If there is, that's fine, if there isn't, that's fine too. My goal is to live without regrets, and by association, to die without regrets. I figure that we all die soon enough, so why worry about the afterlife? On the note of rotting, my wish is to be cremated, so... yeah. Not really my cuppa tea to be buried. I don't see the purpose.
I do feel that you can find a "deep and meaningful" reason if you look for one. You find what you look for, and in the words of a good friend, you attract what you give off. I try to give a deep and meaningful reason to life by giving that to others. Lots of time, in my life, I do these things for strangers. I wanna give hope and meaning to people without it, because someone once did the same for me. If it is simply physics or chemicals in our brains or whatever, I don't care. I don't seek to analyze but to experience.
Of course there's no obligation to reproduce. If you want to, go ahead... Just please don't have more kids than you can handle. I believe that every child should be loved, and properly provided for. Quality over quantity I say, we're overpopulated anyways. If I ever have kids, it'll be only one or two, because I know that I wouldn't be able to provide and care for more than that. It's simple logic to me.
And on the note of worrying about what others don't have, I do feel for those who are in third world countries. However, I don't have much sympathy for people from first world countries who "just can't make it". I made myself from nothing, and you can too. I've been homeless before. I think that if you put in the effort, most people can make it. I know that there are some situations people can't work out of for whatever reason. I actually go out of my way to help people who are having difficulty getting through the system and making something of themselves since I know how to work through it efficiently. :3
I feel like I didn't explain it well enough, but hey, I tried.