What's the purpose of life?

I remember something that my therapist used to say. "You need to get motivation and purpose for your life". Sounds easy for some people, but sounds super hard for other people. Sincei was still a kid, i never have a purpose of life. I would just going through life without a purpose. I may found some pupose now (eg. doing some events, going to play with friends, etc.) but, isn't this things i do only for other benefits? what do i get from those? 

I've felt emptiness in my heart. Not just my heart, but my soul as well. Something that i always tried to find but nothing. I found nothing. What should i do now?