My mind can be like a wayward child when left to its own devices. It likes to ruminate, feed me unsupportive thoughts and play with negative fantasies about things going wrong or people treating me badly. None of this is helpful.
I wonder if my brain just gets bored and needs a sense of direction.
Our brains are not who we are or sources of perfect inner wisdom. They simply store, process and feed us information. When not kept busy, they can default into replaying our most common or recent thoughts, whether they are true and beneficial or not.