Learning psychology never goes astray when you live in a world full of people, who are all different. We all need to interact with other people, sometimes on a superficial level, but sometimes on a deeper level. Whether family, friends, colleagues, customers or even enemies; our daily living involves navigating relationships and that's where a deeper understanding of human psychology can help.
Learning about psychology can help you forge a better career path in so many jobs you probable haven't even considered.