Hulk Hogan's 17-year-old son, Nick Bollea, who's started serving an eight-month stay in Pinellas County Jail for crashing his Toyota Supra last August and putting his best friend John Graziano in a permanent vegetative state, is said to be having a hard time being temporarily incarcerated. Really? Not enjoying prison? Even in a private cell? "He didn't understand how awful jail really is until now," said a friend. (Page Six)