Self-concept or self identity refers to the understanding a sentient being has of itself, as can be expressed in terms of self-assessments that involve persistent attributes. It presupposes but can be distinguished from mere self-consciousness, which is an awareness of one’s self.
Self: # your consciousness of your own identity
# (used as a combining form) relating to–of or by or to or from or for–the self; “self-knowledge”; “self-proclaimed”; “self-induced”
# a person considered as a unique individual; “one’s own self”

In Jungian theory, the Self is one of the archetypes. It signifies the coherent whole, unified consciousness and unconscious of a person. The Self, according to Jung, is realized as the product of individuation, which in Jungian view is the process of integrating one’s personality.
In sociology, the self refers to an individual person from the perspective of that person. It is the individual’s conception of himself or herself, and the underlying capacity of the person’s mind or intellect which formed that conception (one’s “true self”)