Introjection:

Introjection, a concept from psychoanalysis, internalizes within one’s self-concept external beliefs, values, attitudes, or feelings from others — especially from significant figures, like children’s caregivers. As adults, we may struggle with internalized negative beliefs imposed on us during formative years. Also see Projection. Introjection consequences in narcissism:

• Internalized narcissistic voices create an inner dialogue reinforcing negative self-perceptions/doubt. 
• Introjects as self-sabotage of personal growth and self-esteem — a self-fulfilling prophecy of failure. 
• Vulnerable narcissists lacking clarity about their emotions/needs rely heavily on introjected external validation. 
• Manipulation/control by narcissists using introjection to create obligation/dependence on their opinions/behaviors. 
• Negative self-perceptions/feelings of emptiness make it hard to identify/express genuine emotions. 
• Disregard boundaries, being more inclined to prioritize their needs/expectations over others.