Of course, Google is in the business of getting you what you're looking for, and knowing everything about you makes it better at its job. When you type rimjob into your search window, Yahoo! might return a LeBron James highlight reel, but Google knows better. Google's many products work better the more it knows about you.
Plus, it's not like any actual people will ever read all of the dirt they have stored on you. Well, not until they have a reason to ask for it anyways.
In 2009, Google's CEO Eric Schmidt warned users,
"If you have something that you don't want anyone to know, maybe you shouldn't be doing it in the first place. "
So maybe it's time to stop treating Google like a smarter, more trustworthy older sibling who has all the answers and more like a friend you trusted until you found the notebook where they track all of your bowel movements. No matter how much good advice they offer you, and how many times they claim the drawer full of hair they collected from your shower drain is "just in case," you'll never feel totally comfortable around them again.