It is very true that we create out own reality. However......and this is a big however; others create their own reality also and when realities collide, we must remedy the incongruities, the damage to the system created by alternate reality. So, we may come up with all sorts of definitions and clever twists of reasoning, but at the end of the day, we are subject to the external forces that make up so much of what we deal with during each day.
Conclusion: Reality is a bitch; deal with it!