Besides being scared of getting too close, what deep, hidden reason, often from growing up, makes a person hold back and not truly share their feelings with others in their relationships?

A deep, hidden reason, often originating in childhood, that causes a person to hold back from truly sharing their feelings in relationships is the ingrained belief that their authentic emotional expressions or vulnerabilities are inherently unsafe or unacceptable. This belief develops from a persistent lack of emotional safety during formative years. Emotional safety refers to a psychological state where an individual feels secure enough to express their thoughts, feelings, and needs without fear of punishment, ridicule, rejection, or exploitation. When a child's genuine emotional displays—such as sadness, anger, fear, or a need for comfort—are consistently met with negative reactions like invalidation, criticism, punishment, or neglect from primary caregivers, the child learns to perceive their internal emotional world as a dangerous place to reveal. Invalidation occurs when a caregiver dismisses, denies, or judges a child's feelings as wrong or inappropriate. This repeated experience teaches the child that expressing their true self or needs will lead to adverse outcomes, such as losing connection, being shamed, or causing distress to others. Consequently, they develop a protective mechanism of learned emotional self-protection, where they suppress, hide, or alter their authentic feelings to avoid anticipated harm. This learned behavior carries into adult relationships, manifesting as a pervasive reluctance to be emotionally vulnerable. The individual holds back not merely from a general fear of intimacy, but because they genuinely anticipate that sharing their true feelings or inner experiences will make them appear flawed, burdensome, or unworthy of love, thereby risking rejection or further emotional pain. For instance, a child whose expressions of sadness were consistently mocked or ignored might grow into an adult who habitually masks their distress, believing that openly sharing such feelings will only invite judgment or be met with indifference.