Why do I look confident but agonise over everything privately?

From the outside you seem sure of yourself. Inside, every choice is fought over before it ever reaches the light. That gap is exhausting, and lonely, because the people who see your calm surface have no idea what it cost to produce it. You are carrying the whole struggle alone and letting no one see the strain. Here is something worth knowing: the private agonising is not what makes the work good. Often it just makes it late and makes you tired. The confident result and the inner torment are not cause and effect. You could ease the second without losing the first. Much of the wrestling is not refining the work. It is you trying to feel certain before you are allowed to act. So let the certainty come after, not before. Set a limit on the deliberation, decide, and act while some doubt remains, because it always will. And let one trusted person see a little of the messy middle. Being known in your uncertainty, not just admired for your polish, is how the loneliness of it starts to lift.