Negative core beliefs: Destructive architects of our self-esteem

Core beliefs are fundamental assumptions we hold about ourselves, other people, and the world around us. These beliefs are not inborn; they develop over time as we interpret early experiences, respond to feedback from others, and make sense of significant events (Beck, Rush, Shaw, & Emery, 1979; Young, Klosko, & Weishaar, 2003).

Once established, they tend to operate beneath conscious awareness, shaping how we make sense of situations, handle difficulties, and relate to others. When these beliefs are negative, they often form the foundation of low self-worth and avoidance patterns, holding people back from recognising their genuine strengths (Fennell, 1997; Neff, 2003).

How core beliefs form

Unhelpful core beliefs generally arise through several interacting influences:

• Early life experiences: Childhood relationships, attachment patterns, and the quality of care received lay the groundwork for beliefs about one’s value and safety.
• Social feedback: Comments or treatment from teachers, peers, and other influential figures, especially if dismissive, critical, or invalidating, can reinforce negative views of oneself.
• Close relationships: Interactions within families, friendships, or romantic partnerships strongly shape beliefs about worthiness, capability, and lovability.
• Stressful or traumatic events: Experiences such as bullying, rejection, abuse, or persistent failure can lead to beliefs about being powerless, inadequate, or not good enough (Clark & Beck, 2010).
• Cultural and societal pressures: Expectations around success, appearance, or achievement can foster self-criticism and feelings of deficiency.
• Cognitive processing: After a belief is formed, it acts like a mental filter. People tend to notice information that fits with their beliefs and overlook what contradicts it, focusing on what seems to confirm their perceived flaws (Fennell, 1997).

Common unhelpful core beliefs and dysfunctional assumptions:

• “I have no value.”
• "I am not good enough"
• "I am a failure"
• "I am unlovable"
• “I’m not capable.”
• "I am ugly"
• “I don’t deserve to be happy.”
• “I need to please others to be accepted.”
• “I can’t change anything.”
• “Others will eventually hurt or abandon me.”

The link between core beliefs and low self-esteem

Negative core beliefs lie at the centre of low self-esteem. Fennell’s cognitive model describes them as rigid “bottom-line” beliefs that trigger negative expectations, avoidance, and safety behaviours, all of which keep the belief alive (Fennell, 1997).

For example, if someone believes they are incompetent, they may shy away from new experiences or challenges, missing out on evidence of their abilities. Achievements or positive feedback are frequently dismissed, while mistakes are magnified, reinforcing the distorted belief.

Negative core beliefs extend far beyond low self-esteem, often contributing to a range of emotional, behavioural, and interpersonal difficulties. Beliefs such as “I am unworthy” or “I am powerless” can make individuals overly self-critical and prone to depression and anxiety, as they internalise failure and perceive the world as threatening (Fennell, 1997; Beck, Rush, Shaw, & Emery, 1979; Rimes, Smith, & Bridge, 2023). These beliefs may lead people to prioritise others’ needs over their own, attempting to compensate for perceived inadequacies, which reinforces feelings of helplessness and self-neglect (Neff, 2003).

Negative core beliefs can also increase vulnerability to substance misuse as a coping mechanism, difficulty trusting others, and, at times, irritability or aggressiveness in response to perceived criticism or rejection (Young, Klosko, & Weishaar, 2003; Beck et al., 1979). In this way, deeply ingrained maladaptive beliefs shape not only self-esteem but also emotional regulation, interpersonal functioning, and overall psychological well-being.

Using theory B in therapy

To help people explore and address their core beliefs, therapists often use a distinction between two explanations:

Theory A

“The issue is that I am incapable.”

This frames the belief as a fixed truth.

Theory B

“The issue is that I fear or believe I am incapable because of past experiences, like criticism, bullying, or repeated failures. The belief is learned, not an objective fact.”

This perspective recognises the belief’s origins and opens the door for evaluation and change. Therapy then focuses on examining the evidence, exploring alternative interpretations, and fostering more realistic self-appraisals. 

Transforming distorted core beliefs

Even long-standing negative beliefs can be reshaped. Helpful steps include:

• Recognise the belief: Identify the core statement and the assumptions connected to it.
• Review the evidence: Look at past successes, positive relationships, and personal strengths that contradict the belief.
• Create balanced alternatives: Replace extreme statements with more accurate ones, for instance, “I’m learning and capable; making mistakes is part of growth.”
• Experiment behaviourally: Try new actions that support the revised belief, such as taking small risks or seeking constructive feedback. (Dobson & Dobson, 2018).
• Strengthen and maintain change: Repeated experiences that support the new belief help it become more natural and integrated over time (Fennell, 1997).

Example: Someone who believes “I’m incompetent” may overlook major accomplishments and fixate on minor errors. Therapy would involve exploring the experiences that shaped this belief, recognising overlooked successes, and practising tasks that highlight their ability. Gradually, they may adopt a healthier belief, such as: “I am capable and improving, and mistakes help me learn.”

Our beliefs about ourselves quietly shape the way we experience life, influencing our thoughts, feelings, and actions. When these core beliefs are negative, they can underpin low self-esteem, avoidance, and a distorted perception of our abilities, masking the strengths and qualities we already possess.

With conscious effort, these long-held beliefs can be examined, challenged, and gradually replaced with more realistic, balanced views that reflect both our actual experiences and inherent worth. By recognising everyday achievements, small acts of perseverance, kindness, or responsibility, and personal qualities such as empathy, creativity, or resilience, individuals can learn to treat themselves with the compassion they deserve.

This process, central to cognitive-behavioural approaches, strengthens self-worth, transforms the way we see ourselves and the world, and fosters confidence, authenticity, and psychological wellbeing.

References

Beck, A. T., Rush, A. J., Shaw, B. F., & Emery, G. (1979). Cognitive therapy of depression. Guilford Press.

Clark, D. A., & Beck, A. T. (2010). Cognitive therapy of anxiety disorders: Science and practice. Guilford Press.

Dobson, D., & Dobson, K. S. (2018). Evidence-based practice of cognitive-behavioral therapy (2nd ed.). Guilford Press.

Fennell, M. J. V. (1997). Low self-esteem: A cognitive perspective. Behavioural and Cognitive Psychotherapy, 25(1), 1–26.

Neff, K. D. (2003). Self-compassion: An alternative conceptualization of a healthy attitude toward oneself. Self and Identity, 2(2), 85–101.

Rimes, K. A., Smith, P., & Bridge, L. (2023). Low self-esteem: A refined cognitive behavioural model. Behavioural and Cognitive Psychotherapy, 51(6), 579–594.

Young, J. E., Klosko, J. S., & Weishaar, M. E. (2003). Schema therapy: A practitioner’s guide. Guilford Press.