I can definitely emphasise with your thinking. When I ran my own company, or worked together with other freelancers I had the same problem. My private self and my professional self was the same entity. It was really hard to keep things apart, and as an effect of that had trouble with my priorities and my health (phycological and physical) was suffering.

But I found after working for bigger companies (both as contractor and later as employee) that my situation quickly changed. Working together in bigger groups with established rules of conduct (such as office hours, vacations etc.) greatly helped me to balance my life.