Your belief system can be influenced by someone else without you knowing. Cognitive biases are an easy in for bad actors because CB’s are built into the human experience. Learn about the different biases and then start a regular practice of asking questions like “how did I come to know this claim I am making” or “what were the thoughts I had before taking a particular action?” This is a legitimate form of self care. These types of questions can lead to growth.
Who is the author of your personal belief system? If you belong to or identify with a group of like minded individuals then all of your beliefs are adopted and you are not your author.