Thank you so much for the help guys, I really appreciate it, you ROCK!
I intend to do as you said, I will write an email to the library and explain them the situation as you guys suggested and I hope I won't get fined, but I am really very happy that the library won't send the police after me, thank you so much for calming me down, guys!
After all, once I borrowed 15 books from the library and I returned them all in time, so I hope the library guys would understand it has been a misunderstanding!
I will keep you guys informed of what happens with the library issue!
Thank you so much again, you guys are the best people in the world!