Nah. World's still round. Your weaselly "for us" is just begging the question. You can't just redefine belief as fact, that's why we have different words for them.
Claim we don't share the same reality if you like, repeat it a hundred times, but if I punch you in the nose, it will break in both our realities. And when you protest, my repeated assertion that your nose doesn't hurt in MY reality is unlikely to cut much ice with you.
Reality is what you and I agree it is.
If you think the world is flat, and I think the world is flat, then for us: the world is flat.
Disagree? Well then, we don't share the same reality.