Ok, scary = frightening (source: https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=define%3Ascary)
And we often hear "it is frightening" and "I am frightened because of frightening movie", but we never say "I am frightening".
SO, I think "it is scary" is correct while "I am scary" is incorrect. But why googling "I am scary" shows like 28000 results (https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=%22i+am+scary%22).
So, is "I am scary" sentence right or wrong?