How do I go from building a product to building a company?

You can build a product. That is a genuine skill, and it is why you got here. But building a company is a different animal, and it overwhelms you because it is not one problem, it is a hundred, hiring, money, culture, customers, all at once. Feeling swamped is not a sign you are not cut out for it. It is a sign you are early. Here is what helps. A product is a thing. A company is a system of people and moving parts, and no one masters all of it up front. You do not have to. You have to learn it in the order it comes at you, one problem deep enough to solve, then the next. The founders you admire felt exactly this overwhelmed. They just kept taking the next problem. So stop trying to hold the whole company in your head. Write down the three things that matter most this quarter and let the rest wait. Progress comes from narrowing, not from carrying everything. You already built something real. Now build the company around it one deliberate piece at a time.