Interestingly enough, I'm writing a book with a similar purpose, only it's less an autobiography and more a collection of random thoughts. Either way, I second League_Girl. If your family is your only serious concern, fake names are the way to go.
If there's one thing I strongly suggest, it's a Google search on e-book publication services. Amazon isn't the only platform that exists for authors wanting to self-publish their works, much less suitable for everyone.
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“They laugh at me because I'm different; I laugh at them because they're all the same.”
― Kurt Cobain