Google Webmaster Tools = Lower Search Rankings

One of my sites ShareMyLife.info was doing very well on Google under the keyword “my life is awesome”, so I thought, maybe I should setup Google Webmaster for that website to improve the rankings. Little did I know when I checked my analytical logs today, under the keyword “my life is awesome”, my site actually dropped to position 18. That means it dropped 16 places overnight when setting up Google Webmaster Tools.

Further looking into it, the URL that was index in Google was http://www.sharemylife.info/?cat=11, it is now removed from the Google Index.

Here I am thinking that it will improve my websites rankings, but all it does is decrease it. Maybe I should get rid of it all together to see if that improves my websites position in Google?

Has this happened to you? Please tell me what you think? What other factors do you think might have negatively affected site rankings?