The human mind needs goals, you are without a goal (or you are ignoring your goal) so you feel life is empty.

Think hard and deep; are there things on this planet that you would like to achieve? Family, work, travel, home, inventions, helping others?

Write it down, and start to think about how to reach that goal. When you have some steps that would take you closer to your goal take those steps.

My personal take is that you are programed to wanting kids, so that should be a goal for most people.