Why do people like Coleen McLaughlin feel that it is necessary to write an autobiography at the age of 21?

the uneducated generation of today buys this s**t. Your right how the hell can you write a bio on yourself at 21 when all you have done is slept with shrek and spent all his cash...there must be a market for this bollox if its getting published...stick me on a desert island like tom hanks in cast away with a friggin ball for company.