While you go about your days and weeks working hard and long to build something great, view it from above once in a while. See your business, and even you working in and on it, as an outsider.
While your business is part of what you do, it’s not who you are. Stay true to who you are while you work on your business, and you can avoid being emotionally swallowed by it – the business results telling you if you can be happy or not.
You’re a human being working on a business. Not a “human doing,” trying to be, by working on a business.