It's impossible for you to be alive.
I have been following Dembski's idiotic top down appoach to probabilities and had a thought about the odds of anyone being alive.
A quick search gave me the number of sperm cells produced on each ejaculation at around 200 ~ 600 million. If I remember correctly each sperm is different i.e., each one will produce a different human being. Someone correct me if this is not so.
So what are the odds of anyone being alive if you factor in all the ejaculations, chance encounter, honey i got a headache tonight, etc?
I would bet if you punched in all the variables from the first homo sapiens, the odds are higher than all the atoms in the universe.