One can wrap one’s mind in knots thinking about this. I think the metaphor of the scientific approach can offer some help. Humans are always percieving things, and then making guesses about what they will perceive next, based on what they’ve perceived in the past under similar circumstances.
I think that for each of us, our perceptions of reality are objective, as long as we keep them to ourselves. It is when we try to share these perceptions that we get into trouble, because someone who sees the same thing from a different perspective, can easily sound like they are seeing something quite different.
Still, we each have our own perceptions, and I think that is as close as we all get to objective reality. We rely on our perceptions, knowing that they can lie. We can have more or less faith in our perceptions, depending on our predilection.
But there are so many confounding factors. There is the uncertainty that we are perceiving what’s out there very accurately. There’s uncertainty about other people’s perceptions being accurate. And worse, there’s the difficulty in communicating our perceptions to each other in a reliable way.
We can create our own reality in a number of ways. First is using our perceptions, and editing them, or biasing them according to our preferences. We can control how we perceive things, and even, to some extent, what we perceive. We may also be able to influence reality just by observing it. Indeed, our minds may influence reality without us perceiving that influence.
People speak of consensual reality. I think of models and the accuracy of the model. The more accurately we can predict what will happen, then the more close we are to an objective reality, I think. Still, none of this is very satisfactory for anyone who wants certainty, or even a little smidge of certainty. As I said, one’s mind can well end up in a huge tangle of yarn, if one isn’t careful.