For better or for worse, friend relationships, or the lack of them, can largely determine our happiness. They help us develop the rhythm of our days and can even shape our goals and our dreams, encouraging us to become who we want to be. Despite their vital importance, though, true friendships in adulthood can be much harder to make and maintain than they were during the golden days of lunchboxes or the late-night camaraderie of dorm rooms. Take heart: if you’re willing to set your mind to it, you too can develop outstanding friend relationships that help you thrive in ways you never thought possible.