The first thing you should realize is that there will never be a time when you disappear or die, because there never was a time when you were born. You have always existed as Consciousness, and you will always exist as Consciousness.
Is there death for you? For whom is death? The body which dies, were you aware of it, did you have it, during sleep? The body was not, when you slept, but you existed even then. When you awoke, you got the body and even in the waking state you exist. You existed both in sleep and waking. But the body did not exist in sleep and exists only in waking. That which does not exist always, but exists at one time and not at another, cannot be real. You exist always and you alone are therefore real.
... We are so engrossed with the objects or appearances revealed by the light, that we pay no attention to the light. In the waking or dream state in which things appear, and in the sleep state in which we see nothing, there is always the light of Consciousness or Self, like the hall lamp which is always burning. The thing to do is to concentrate on the seer and not on the seen, not on the objects, but on the Light which reveals them.
—Sri Ramana Maharshi