RWY INCURSION WHEN A CPR TWIN JET PIC TAXIES INTO POS WHILE STILL ON GND CTL AT MMU.

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FLT TO PICK UP PAX WAS BUMPED UP 1 HR. SO CREW WAS RUSHED TO GET GOING. I WAS ALSO INVOLVED IN AN EMOTIONAL DISCUSSION WITH MY SUPVR IMMEDIATELY BEFORE MY HURRIED ARR TO THE ARPT WHICH DISTR ME FROM FOCUSING ON THE TASK OF OPERATING THE ACFT. TAXIED TO RUN-UP BLOCK OF RWY 5 WHERE WE ALWAYS REMAIN WITH GND CTL UNTIL RECEIVING OUR RELEASE. JUST BEFORE GND CALLED WITH OUR RELEASE; AND INSTRUCTIONS TO CONTACT THE TWR; THE PNF NOTICED THAT THE ROUTING IN OUR FMS WAS NOT AS WE WERE CLRED. HE STARTED CHANGING THE ROUTING WHEN GND CALLED AND GAVE US NEW DEP INSTRUCTIONS; AND SAID TO CONTACT THE TWR. HE WAS FINISHING THE ROUTING FIX AND RUNNING BEFORE TKOF CHKLIST WHILE I WAS SHUTTING DOWN THE APU. AS I BEGAN TAXIING UP TO THE HOLD SHORT LINE I ASKED HIM IF WE WERE CLRED TO GO (TKOF IS WHAT I SHOULD HAVE SAID) AND; WITH HIS HEAD DOWN RUNNING CHKLIST AND LAST MIN FIX TO FMS ROUTING; HE SAID YES. THE GND CTLR'S CHANGE TO OUR DEP INSTRUCTIONS SOUNDED MUCH LIKE A LCL CTLR'S WHEN CLRED FOR TKOF (HDG AND ALT TO MAINTAIN ON TKOF). I THOUGHT THE INSTRUCTIONS I HEARD WERE THE LCL CTLR'S; NOT THE GND CTLRS. THE PNF (STILL HEAD DOWN) NEVER SWITCHED TO THE TWR AND I ROLLED INTO POS ON THE RWY AFTER VERIFYING WITH MY OWN EYES THAT FINAL APCH WAS CLR. GND CTL THEN INFORMED US THAT WE HADN'T CALLED THE LCL CTLR; AT WHICH POINT; WE CALLED HIM. HE INFORMED US OF OUR MISTAKE; WHICH WE WERE NOW ALREADY AWARE OF. I FORGOT TO MENTION ALSO THAT EARLIER IN THE DAY MY VEHICLE BROKE DOWN AND HAD TO BE REPAIRED. I WASN'T SURE IF OR HOW I WOULD GET TO THE ARPT IF IT HADN'T BEEN FIXED. MY STRESS AND DISTR LEVEL WERE PRETTY HIGH AS WE BEGAN THIS FLT AND I'M SURE HAD A LARGE ROLE IN THIS INCIDENT. WE SHOULD HAVE SLOWED DOWN AND DELAYED OUR DEP UNTIL THE CORRECT ROUTING HAD BEEN INPUT INTO THE FMS. ANYTHING OTHER THAN BEING PARKED ON THE PAVEMENT IS BAD WHEN A CREW MEMBER'S HEAD IS BURIED IN THE COCKPIT.