All psychological problems are on a continuum. We speak about psychological disorders when the problems start to stay in our way to lead productive and happy lives. Sometimes the signs that something in our life is not as it should be are present long before a diagnoses of a particular disorder, sometimes a disorder is never diagnosed but the person feels empty, not content and frustrated with life.
You can do a lot to prevent psychological suffering and psychological problems.
Therapy is for everyone who wants to feel happy and lead a fulfilling life, but feels stuck and unhappy, sees no way out of her/his situation.
Therapy is for people who do not believe in themselves and feel helpless and exposed to life.
Therapy or psychoanalysis is for people who want to establish a deeper relationship with themselves and expand their self-knowledge.