Why does existence puzzel us so? Yes, you can't deny that you exist, but what lies beyond your own existence? A world that is made real by your senses? Or perhaps a semi-theoretical world made real by your sense and your knowledge that things that you can't perceive exist, and are the reasons behind certain events that you may perceive?
So does something exist
to you if you are not told that it exists? No!
Could absolute truth be right there underneath your nose, but because you cannot comprehend it and are not told
what it is, you unconciously deny it as a part of what you are percieving.
Most likely it is impossible to expalin what absolute truth is to a human, we are still too primitive

.
I don't think it is possible to deny that an absolute and objective truth exists, even if you exist alone in the universe so does absolute truth, in a sense YOU then are the absolute truth and the universe.
And theoreticaly if you believe this with unwavering faith you then controll all the aspects of your own existence, believing that everything happening to you is a result, as opposed to a cause, of your conciousness.
Hmm, I hope that makes atleast some sense. (Thats another question why does something have to make sense to be real??)