You learned to walk without thinking about it.
You do not remember learning to walk, yet you do it every day. That is how your subconscious works: it stores responses and runs them automatically. The same goes for fear, tension and habits. That is why you cannot change them with your rational mind alone.
Your critical mind stands like a gatekeeper between what you know and what you do. In hypnosis, that gate opens a little. That’s how we can work right where the pattern lives.