Before i read this i actually came to the same conclusion about myself existing. I know i have to exist. The other part is like what if awareness can pick up on things that are impossible too? Like that they appear too as impossibilities and i wouldnt know it? So far the only thing ive proved is I (as in just my awareness) exists but idk about anything else. This questioning does sound very irrational i know, but it freaks me out enough to consider it.
Yeah, it's quite irrational. Something being "impossible" is more or less just a tautology for something not existing, so you're back to square one. How can thing X be impossible if it's there for you to sense and clearly has a form? Clearly it *is* there and exists in some sense. If I'm not entirely mistaken, you're probably talking about those objects being illusory in some way, as in their essence is somehow different from how you perceive them (or how they seem to exist in this reality), or that they're "fake".
I haven't dropped my go-to response to these threads yet, so here we go: why does it matter? Why does any of this matter? I couldn't care less whether this is actual, fundamental reality or not, whether my existence is solipsistic, etc. It makes absolutely no difference, and I can't prove it one way or another. It's little more than a waste of time to even think of this. It gets you nowhere. It's an intellectual dead end.
Whether a table "really exists" is ultimately irrelevant to me. Why? Because it exists to me, and everyone else in this existence, in practice. I can utilize it. It exists to me in this reality, whatever the fundamental nature of said reality. I'm in this "container", and all that matters to me is what takes place in the container and how it operates, how the laws within the container work. The ultimate realness or whatever of the stuff inside the container is irrelevant. And besides, I have no reason to assume it isn't fundamental reality.
Okay, everything may be fake and so on. Now, tell me why this matters to you. This life is what it is, and it's going to keep going like it has been since you were born, until your death, whatever the fundamental nature of it.
This pondering would be worthwhile if it was at all possible to even investigate. But no, it's not. It's impossible to prove or disprove.