I see way too many people taking their jobs more seriously than they ought to. There's something very odd about people who sideline their families and close ones, because their daily work is more important. They're way too busy to speak, or meet or be nice even when they leave work.
I think unless you're in a field where lives are at stake, it's well warranted, and it's noble what you're doing. For the vast majority of us, it's a job. You have one, you don't. Most of us are smart enough to get a new one. You do your best, you do it at work, and keep it there. Note down things on a notebook, things that you can continue on the following morning.
Trying to be as honest, upfront, easy-going and helpful, the kind of person you are at home, also helps bridge things better. That way, you don't need to be a different person, and switch between them.
Generally, just take it easy, you're not out saving the world. Do your best and carry your bag home, not your baggage.