If you aren’t worried that Google, Microsoft, and/or the government are or might be paying attention to your search engine queries you probably don’t need to read any further. You probably also like that when you use Google or Bing or some web sites they throw up advertising based on your previous web searches and your location.
You should also probably have your head examined, as you clearly are not currently displaying an appropriate level of paranoia. (Remember, just because you’re paranoid, it doesn’t mean someone isn’t out to get you.)
For you dedicated realists out there, there is Ixquick, an anonymized search engine. (Yes, there are others, but I like this one.)