How can I resolve this credit card scam nightmare?

Large credit card charge. The item in question was not what it appeared to be, but if I had looked closer at the website I might have been able to figure it out. I realized only hours after internet purchase I had been duped. Freaked out and reported card stolen. Now they want a police report and I'm just really stressed about the whole thing. If I tell the truth am I going to have to pay? What should I do?