You do not need to contact Google to become part of their search engine.
Google and other engines use spiders to index webpages, and only the search engine will decide what keywords are used and what rank you get.
Meta Tags which were once used to identify keywords are now ignored by Google.
Google still offers tools so that you can be sure your site was considered: http://www.google.com/intl/en/submit_content.html
You can also purchase a high rank for specific keywords, called sponsored links, and other services provided by Google. http://www.google.com/intl/en/about.html