If you have a Google account of any kind, then the chances are they are recording your web history. You can delete this and "pause" recording of your history by going to:
You can also change other settings related to your Google accounts here:
The privacy settings are here:
You might want to go to
and change those sites that are allowed to use your Google Login to supply you with customised "information".
Finally, you may want to browse this, just to check: