This is the ultimate existential tension we all face.
There has never been another you in the entire history of all that is. You are a unique part of this wondrous universe that is growing exponentially grander the more we know of it. You are the very consciousness of the universe, and only you can be you.
And yet you are so small, and your time here so fleeting. Your name and life history will fade from memory within a few generations of your death, which is approaching more rapidly than you want to imagine.
We are mortal inhabitants of a tiny planet orbiting an average star in a middling galaxy in a small speck of an incomprehensibly large and seemingly indifferent universe. Yet we are alive and aware and writing blog posts and hugging our kids and making art and dancing to the music of life as only we can.
Be awesome because you are indeed amazing. You are one in a billion. Be humble and grateful because you are just a mere human, nobody more special than anyone else. You are one of billions.