For me, as an atheist, I see this life as an adventure. I will have eternity to not exist...but I am one of the -very- rare few who gets to experience existence! Also on top of that I get to be human, one of the most amazing animals of all! How fantastic and lucky am I? I get this treasure to be for my brief time on this planet and unlike most animals, I get decide my reason for being here.
My mother once said to me when I was in a very similar place that you are "If you were gone due to sadness and stress today, imagine what possibly amazing things you could miss tomorrow!" She was right damnit, If I had exited when I wanted to a few years ago I would have missed all the amazing things and people I have in my life now. (and they would have had the terrible misfortune of not knowing me, that would have been a -terrible- shame for them )
So whenever I'm feeling down I try to remind myself "Imagine what could be tomorrow"
As for "what is my purpose?" You are so lucky as an atheist to decide that it's whatever you love, or enjoy, or are passionate about. If you haven't found that thing yet, then keep looking. It could arrive tomorrow.
Sorry for my rambling.
My mother once said to me when I was in a very similar place that you are "If you were gone due to sadness and stress today, imagine what possibly amazing things you could miss tomorrow!" She was right damnit, If I had exited when I wanted to a few years ago I would have missed all the amazing things and people I have in my life now. (and they would have had the terrible misfortune of not knowing me, that would have been a -terrible- shame for them )
So whenever I'm feeling down I try to remind myself "Imagine what could be tomorrow"
As for "what is my purpose?" You are so lucky as an atheist to decide that it's whatever you love, or enjoy, or are passionate about. If you haven't found that thing yet, then keep looking. It could arrive tomorrow.
Sorry for my rambling.