You can't be sure of a objective reality in any case. You can't even reliably say one exists at all.
Just take what you perceive and process it through logic and experience (if you see a flying hippo after taking lots of drugs, then it's probably a hallucination), you probably won't go too far wrong that way. Things you perceive can make you happy and unhappy, and even kill you, and affect you. Even if they aren't objectively there.
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