Odds of existing are so low that it doesn't even make sense?

Oh no. I would try this one. A trillion to one you open your eyes and you see nothing because you don't have eyes. So how could I have opened my eyes and I can see? Because if you hadn't, you couldn't. If you WERE one of the millions of possible things you could have been you wouldn't know it. The lottery attaches a random person to a prize. Your prize wouldn't exist if you weren't in it. You are not MATCHED to this lucky break, YOU ARE this lucky break. If the universe rolls the dice enough it will get three hundred sevens in a row, INFINITY NOT REQUIRED.

It all sound coincidental because you are imagining a you waiting in a train depot and being given a mosquito life or a human life. The train depot doesn't exist. You are the winning ticket, not the ticket holder. You could only be the ticket holder by being the ticket.

you might well say the odds seem high, intuitively

calculating odds however isn't strictly speaking a matter of intuition, it is simple math. the problem here isn't that the math is beyond you, it's that you don't have the actual information necessary to do that math with.

you don't know the odds in other words. all you have is your "feeling" that the odds should be very bad.

no one else knows the odds of course, really. probably the best guess, if we're going to spend time making guesses, is that, if the odds are in fact really bad, then the dice must be getting thrown a hell of a lot of times

We were all here before we became human. With the current ways of the world you are right. Existing is becoming more and more threatened.

You must be very, very lucky then.