So no, you weren't necessarily the fastest and strongest swimmer. Even better, you were chosen from among millions.
(Yes, that means we're all Chosen Ones and any of us can bring balance to the force.)
Reading the article it seems less like the egg is making a choice, and more like the egg is more attractive to some sperm than others and that causes them to swim faster and in a straighter line to it.
You're neither the sperm nor the egg. You're the combination of both the sperm and the egg. 50/50 of what you are came from your mother and your father.