Friends and family are protective factors against depression
"The extensive research identified socializing as the most impactful defensive against depressive symptoms; more specifically confiding in friends and leisure time with family and loved ones.
This was even true when the researchers adjusted for genetics and trauma incidence.
In the other direction, daytime-napping and habitual TV watching yielded robust relationships with depression." Adler taught that If one has social interest then one evidences or enacts a “useful” style of life. If one does not have social interest then one is self-absorbed and is concerned only with one’s self. Such a style of life is “useless.” Sources: