Without you

 Since my birth 8786 days ago,

My heart has beaten more than 910828800 times.

 Since your birth 4555 days ago,

Your heart has beaten more than 472262400 times.

You.

Everything that I always wanted to be but never was.

And somehow still, everything I am.

But mostly, everything you are.

 How in the world did I live 4231 days without you, little sister?