So, you ask, who are you? Well you're you, but not just once. You're you over and over again.
I'll rephrase: if our identity is defined by our actions, then what is yours? Are you One Who Engages in Fisticuffs with Helpless Trees? No, what defines you is that you try again. Should you starve, you try again. Should you fall from a cliff, you try again. Should you be digested by some magnificent predator, you try again.
And now Earth, humanity, life...you can give all of it the chance to try again too, because you and all your siblings who fell from the sky are the Ones Who Try Again.