Hey @galotta, thank you so much for leaving such a meaningful comment. I like how you worded this
a good determining factor in classifying a condition as a 'disorder' or just a quirk is whether the person in question *feels* he or she is suffering from it.But, please note that here, of course, the psychologist shouldn't rely on subjective evidence (e.g how one feels like) only. Occasionally, for one reason or another, some people withhold information from their therapist - this is also one of the reasons misdiagnosis can occur. Relying on both subjective and objective evidence (e.g crying, lack of sleep) is a safer way to classify a condition.
All the best :)