Because everyone is worthy
Wikipedia says that including yourself should not be an option.In their own words: "If you are worthy of inclusion in the encyclopedia, let someone else add an article for you."
Ok, we get it. But the world is made of more than 6 billion people. To be alive, working, parenting, having fun... These are things that also change lives and consequently, changes the world we ALL live in.
So yes, YOU ARE WORTHY of having your own article page on the web.