Identity raises the stakes on every result. A bad quarter stops being a business outcome and becomes evidence about your worth, which brings in shame, secrecy, and defensiveness - none of which help you read a chart.
It also makes it hard to stop. Reducing size, taking a job, or quitting a method all threaten a self-image that has been announced to other people, so traders persist for reasons that have nothing to do with expected value. See grit-vs-stubbornness.
Keep some separation. Describe what you do rather than what you are, hold interests and income outside markets, and score behaviour rather than outcomes so that a losing week is a set of executions rather than a statement about you.
Related: fixed-mindset, shame-spiral, quit-point, comparison-trap