For that Google identifies you, you must have a Google account. The email and password that you use to access the services of the american giant (Google Calendar, Documents, Drive,..) correspond to your Google account. However, it is impossible to know with accuracy who you are.What Google knows about you. Google is more than a simple search engine because it collects a mass of data from your research, and that says a lot about you.. To find out what Google knows about you, you just log in to your Google account and go on this page, for YouTube it is here. In the section personal Information and privacy, to the right, click the option of Your personal information.