AN LR35A ACR FREIGHTER CREW TOOK OFF FROM A PARALLEL TXWY INSTEAD OF THE RWY ON AN EARLY; FOGGY MORNING OP. THE RPTR RECOGNIZED HIS ERROR DURING THE LATTER STAGE OF THE TKOF.

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I DEPARTED FROM A PARALLEL TXWY INSTEAD OF THE RWY. I NEVER THOUGHT I COULD EVER DO SUCH A STUPID; UNSAFE MANEUVER -- 'I'M A PROFESSIONAL!' LEADING FACTOR: FATIGUE. SECOND: 'THAT WILL NEVER HAPPEN TO ME' ATTITUDE. THIRD: COMPLACENCY. FOURTH: WX. FIFTH: I WAS IN A HURRY 'GET HOMEITIS.' WE HAD ALREADY BEEN UP PAST 24 HRS EVEN THOUGH; TECHNICALLY; WE WERE LEGAL AS FAR AS DUTY TIME GOES. AFTER BEING CLRED FOR TKOF BY ICT TWR; I LINED UP ON A LONG; WIDE PARALLEL TXWY AND TOOK OFF; RUSHING MYSELF AND THE POOR COPLT; TOO. I REALIZED MY HUGE ERROR RIGHT AFTER TKOF; EVEN BEFORE WE LIFTED OFF. TWR SAID NOTHING. BEFORE SWITCHING TO DEP; I SQUEAKED OUT A 'SORRY ABOUT THAT.' THEY DIDN'T SAY ANYTHING EXCEPT; 'CONTACT DEP; GOOD DAY.' COMMUTER ACFT WERE BEHIND ME AND MUST HAVE SEEN IT; IN DISBELIEF. NOTHING WAS SAID. IT WAS DARK AND FOGGY. TWR MAY NOT HAVE BEEN ABLE TO SEE EITHER. TWR AND GND MAY HAVE BEEN THE SAME PERSON THAT EARLY IN THE MORNING -- MAYBE HE WAS BUSY. THIS EVENT HAS CAUTIONED ME ABOUT 2 THINGS: 1) FATIGUE IS INSIDIOUS; AND 2) I'M NOT AS GOOD AS I THOUGHT I WAS -- BUT I GET BETTER; FOR SURE.