That is a really good one about finding life's purpose. We really have to create what our purpose is. For myself, I work, I have my kids, my boyfriend. In their lives I am a catalyst and work at uplifting them all and encouraging them to do better.
With friends and loved ones same thing. We must play an important role in friends and family life. Working toward the positive and helping them know their true nature and potential, also causes us to do the same. As we treat others, this will be reflected back at us. Doing good, reaching out, even if a simple hello can do wonders. Just taking the time to let someone know you love and care for them can make all the difference. Creating a purpose in our life, we don't have to go to Haiti and feed the starving. But we do need to find our passion and make it manifest.
Just keep doing good things and karmically, good things will come around. Oh sure, you will still know troubles. We all have bills to pay in life, and our struggles. But the struggles also make us and believe it or not, they can enrich our lives. We must keep struggling because when we do, we are like the flower which grows from the cracks in the sidewalk and lights up under the sun's rays. We blossom and bloom via the struggle. Then eventually we can relax a bit and just 'be' for awhile.