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"The more I 'study' time, the more confused I become. There is a deep mystery here. I wonder if humans can ever discover the true nature of time."

It has always been a mystery, I guess. Stephen Hawkings once thought time was reversible. At the sub-atomic level, it would seem to be. But it just isn't. Time is merely progression or existence of matter in the material world. I.E. atoms wiggling; but they can't wiggle to "backwards" to "reverse" time at the macroscopic level. (Because of entropy). Time is an aspect of the Universe and when the Universe ceases to exist, so will time as we know it. Outside the Universe, i.e. at the God's eye view, there is no time and everything does happen "at once." I.E. all "time" since the beginning of the Universe is accessible at the same "time." The space twin experiement of relativity basically predicts the same concept of eternity that St. Augustine had.