thoughts
Who you are now will never exist again. As time passes, we slowly become different people; we are amorphous, always changing. This is why you know so much more and think so much differently than even a couple years ago, and as you get older your worldview, your body, your way of life will again and again change. Life has many different phases.
Do you believe then that once you die that's it? You will never exist again? Who's to say that after I die, I won't become the "mind" of some baby that's yet to come into existence in the year 2100?
I believe that, once you die, there is nothing - sleep without dreams. This void is only broken by conscious life - birds, dolphins, humans, and all the other life forms spread across the universe. You broke this void not the moment you were conceived, possibly not even in your first few years of life - but once you became conscious enough to recognize that you were, in fact, alive. For me, I would consider that only in the past few years have I really become "conscious." As for the basis of this, it has to do with the patterns formed by trillions of synaptic connections among cells in our brain. Once you die, the universe will find a place for "you" (there is no better substitute in human language) again, and you will again wake up - whatever life form it may be.
edit - TL'DR - the universe is unconscious. you will only be able to experience the universe if you ARE a conscious part of it - a human, a dolphin, a sentient alien life form. it's a selection bias when you ask how "you" got here, because you would never be able to ask that if all the pieces hadn't landed just right, resulting in your consciousness.