What is wrong with my YouTube account?!!

An email came, told me one of my videos violated some copyright infringement thing. And suddenly one fine day, i tried to log in to give a comment about a video clip. YT told me my a/c was suspended due to "repeated offence". I was at a lost for words. Fkkk! what!? what did i do?! All my past videos are gone now! Deleted permanently! Hai... what can i do to make it right again?
Even my most popular video "The World's best goal keeper" is gone now. What am i going to do... Shit!