In the entire cosmic expanse it's sometimes easy to think of how common you are, but then, stop and think on that for a moment. Truly, how common are you? How many have lived your exact life?
Even biologically speaking, any number of events could have stopped your parents from procreation, or could have stopped the particular combination of genetic traits that make up who you are, from forming in that particular order. Even if we're talking purely just your parents, imagine every single potential variation in their actions and reactions they could have taken if just one thing were even slightly different in their lives and the kind of cascade effect it would have had on your life, should you even have existed as a result.
Now imagine these tens of thousands of potential detours and changes in their lives multiplied by the number of generations your family has existed, then multiply that by the number of species it took to evolve to humanity, then multiply that by the odds of life forming in the particular way it did, then add in the chances of an Earth-like planet forming in a solar system, and a viable system for any kind of life as we know it at all to begin with.
You are a one in a billion's billion's billion's billion's billion's billion's billion's chance. You may be similar to others in some respects, granted, but you are utterly irreplaceable by sheer statistical probability. Never forget that.