Yes, it's an involuntary thing and if you didn't do it you'd die. We know that. The problem is that scientists reckon that the majority of us breathe using only the top third or so of our lungs. What we should be doing is breathing deeper and using our whole lungs, so that our bellies expand with the breath.
Apparently, this is related to stress (yes, a lot of us know that already too). If you breathe slower and deeper, you can not only lower your stress levels, but also your blood pressure and even increase physical performance.