It seems like everybody is thinking at some point in their life about their mission in life. I have read multiple books and listened to different opinions about the purpose of life and what needs to be learned or accomplished in a lifetime.
Examining the world it looks like painful life circumstances or losses in life make us close to finding our mission or to becoming a better version of ourselves. People come to a realization that something they were dreaming about sometimes can stop serving the purpose and place for new dream opens up in their soul. Another popular scenario those drastic changes in life make us closer to finding our mission in life through a painful process of analyzing and soul-searching.
According to this theory, everyone we meet in life was supposed to teach us a valuable life lesson, all encounters are happening for a reason.
It makes life exciting and worth living because it is a journey and we are all passengers.