Science describes how things happen and not why.
There is a joke in an Isaac Asimov robot novel where the students in a class troll their robot teacher by asking the 'why' of something. When the robot gives an answer they ask 'why' again, and keep repeating the request making the robot go into more and more detail.
Over 20 years ago I was struggling with the meaning of life, and I came to the conclusion that the meaning of life was to find meaning. The beauty of this is that it will be different for everyone. For many, it would be family, but for others, it would be something else. I like the idea of working toward some goal.