The thing with purpose is that no one can give it to you but many people import the purpose of others and install it as their own. Religion / nationaism does this to a high degree but if one explored for themselves, the same or better could be achieved independently where people work it out and then develop what they need with others. Most people create habits and traditions that they identify with though and then as times change and they are no longer suitable, they feel lost.

Adaption to the environment is key and change is continual.