We're living because our parents had sexual relations.
Each person has to create their own meaning for their existence, to answer the For What question and to find their purpose.
But before we're old enough to ask such questions, our parents, family members and community members have spent many hours taking care of us. We are born as helpless babies and we need constant care and food and drink for many years. So part of our purpose has to be repaying family and society for all the things we were given before we could even think about what our purpose might be. We should give care to others, as we have received care.
Just my opinion. :)