No.20123
You should definitely read more epistemology. There have been differing opinions on the topic throughout the ages.
Some claim that nothing can be known at all (not even this), or that there's no objective reality to know (but that's just saying you can only ever experience a subjective one).
Sciences generally assume that there is an objective reality, and that the scientific method is likely helping us get better guesses at what it is.
There are also many who claim to know objective reality - they seem to have some sort of dogma or axiom in mind, or be confident in their legendary intelligence.
My stance on the topic: