Perfectionism is not really about caring deeply or having high standards. It is usually about fear: fear of failure, fear of being seen as inadequate, fear that anything short of perfect means something is fundamentally wrong with you. Underneath the relentless self-demand is often an exhaustion that is hard to admit, because admitting it feels like giving up.
Therapy helps you look at where those standards came from and what they are actually costing you. Cognitive-behavioural techniques can help you catch and question the all-or-nothing thinking that perfectionism runs on, while gradual exposure to situations where you let good enough stand builds evidence that imperfection is survivable. Sessions also focus on developing self-compassion as an active practice, so you can hold yourself to meaningful standards without the self-punishment when you fall short.