What if, instead of being human, you are actually an artificially animated construct made from feces? Sort of a shit golem, if you will. Due to the advanced process used to make you into a human-shaped piece of excrement you are indistinguishable from real humans but absolutely nobody could possibly know it. It would still be true. It would still be reality. But abstract truth like this is meaningless. Only perception and interpretation makes reality matter in any way, and this is why I say reality truly lies in our own minds. Because I'm speaking in a practical, workable sense.
Finally, your certainty that a purely objective "reality" actually exists suggests you may want to study up on your physics. I'd suggest you start by reading up on the Copenhagen interpretation regarding wavefunction collapse. Then there's the fact that we are all participant observers in this universe. We cannot be certain that our presence is not affecting any data we gather. Actual reality could be mind-bendingly strange. What if the one-electron universe hypothesis is correct? That's the one that states there is only one electron in the entire universe but it is capable of moving through time so as to be in all places seemingly simultaneously. These things matter to physicists but to the rest of us it's just further evidence that actual "reality" is meaningless without subjective interpretation. What most of us think of as reality is only a consensus opinion. If your personal interpretation varies greatly from the consensus you are deemed to be wrong, but actually there is always a chance that your personal interpretation is closer to the object "truth", except I must state again that this pure "reality" is not actually important in our day to day lives. When you really think about what reality is and begin to question whether it is even possible to know "true" reality you are left realizing you might as well try to believe whatever makes you happiest. You fucking shit golem.