It isn't depression, or anxiety, though it can sometimes appear as a symptom of these better—known conditions. Often, it emerges with cruel ferocity as a chronic disorder completely unto itself.
Its destructive impact on an individual’s sense of self is implied in its very name—depersonalization.

While he can interact with others who have no idea that anything is wrong, Ron lives without spontaneity, going through the motions, doing what he thinks people expect him to do, glad that he is able to at least appear normal throughout the day and maintain a job. He studied drama briefly while in college, and remains enamored of Shakespeare and literature, but an emerging self-consciousness eventually robbed him of his ability to act. Now he feels as if all of his life is an act—just an attempt to maintain the status quo.

Recalling literature he once loved, he sometimes pictures himself as Camus’s Meursault, in The Stranger: an emotionless character who plods through life in a meaningless universe with apathy and indifference. He’s tired of living
this way but terrified of death.

Trapped within the confines of his mind, he is too aware of every thought passing through it, as if he were outside, looking in. At night he often lies awake ruminating endlessly about what’s wrong with him, about death, and about the meaning of existence itself. At times his arms and legs feel like they don’t belong with his body. But most of the time, his mind feels like it is operating apart from the body that contains it.

How sooner we met a good partner in life it's better from that moment our days will be more smoother with a target and sense of meaning

Dissociation is numbness and nothingness; it is a feeling of being lost; it is floating on a cloud that threatens to suffocate; it is automatic speech and action without awareness or control; it is looking at the world and blinking to try to remove the blurry fog; it is hearing and seeing the immediate world and simultaneously feeling very far away; it is raw fear; it is unfamiliarity in familiar places; it is possession; it is being haunted everyday by unknown monsters that can be felt but not seen (at least not by others); it is looking in the mirror and not knowing who is looking back; it is fantasy and imagination; and, above all else, it is survival. Dissociation is all of these things and none of them at once.

The creature who lives inside my brain suggested I do it,” I offered tentatively. “It was very convincing.