I like making up my own purpose. It changes over the years. At differerent times I have been obsessed with leaving home, finding a partner, having a child, getting a degree, finding the job I really wanted to do. At the moment I want to get the damn garden straight and looking beautiful. I would also like to visit as many countries as I can before I am too old.
Some people are obsessed with collecting stamps, playing the bagpipes or breeding chihuahuas. Each to their own.
There's no need to feel lost without religion telling us why we are here. I would hate someone to tell me what the purpose of my life should be now. The thought of some religious leader telling me why I'm here and what I have to do for my life to have purpose horrifies me.