“We are born alone and die alone, but we are born into families where, from early childhood, we absorb modeled behaviors of our parents, siblings, and caretakers. We watch, listen, interact, and absorb it all. This is where and when our core beliefs and blueprints come from—early childhood experiences, often before the age of 10. The core beliefs are the deep-seated thoughts about ourselves that we take on during this phase of development. The reality is that our core beliefs are not necessarily accurate or true. If, for example, we grew up in a household filled with conflict and violence (emotional or physical), or if we were raised with beliefs about the way the world works or the ways women or men should behave that do not align with who we are today, we often struggle in our relationships and choices and grapple with inaccurate fears and prejudices. When our core beliefs include that we are not smart enough, worthy of, or capable of achieving what we want in life, these beliefs or thoughts can lead to settling for less in life. In this case, it is important that we have compassion for ourselves and what we have experienced, and take positive steps to address the thoughts that are holding us back.”

Source: Where Our Negative Thoughts Come From | Psychology Today