AN A320 PLT REALIZED WHILE FLYING THE LAST LEG OF A 4 DAY TRIP THAT HE MAY BE TOO FATIGUED TO BE FLYING.

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THIS WAS DAY #4 OF A 4-DAY TRIP. VERY FATIGUING WITH VERY EARLY MORNING RPT TIMES. THE LAST DAY WAS SCHEDULED FOR 11 HR 49 MIN DUTY TIME; BUT ENDED UP BEING ALMOST 14 HRS. OUR BODY CLOCK WAS SET FOR EARLY MORNING; BUT DAY #4 REQUIRED US TO WORK INTO THE NIGHT. AFTER A 2 HR DELAY IN ORD; WE HEADED FOR LGA. I THOUGHT THERE WOULD BE NO PROB WITH FATIGUE BECAUSE I'M YOUNG AND IN GOOD SHAPE. IT OCCURRED TO ME ENRTE THAT I REALLY SHOULDN'T BE FLYING. THE CAFFEINE FROM EARLIER WORE OFF AND NOW THINGS FELT UNSAFE. THE FLT PROGRESSED NORMALLY; ALBEIT IN SLOW MOTION. LUCKILY THERE WERE NO INCIDENTS. I FEEL THAT WITH THE ONEROUS SCHEDULES AND LONG DUTY DAYS; COMBINED WITH CHANGING OUR SLEEP PATTERNS EVERY FEW DAYS CONTRIBUTES TO LONG-TERM FATIGUE. THE INTIMIDATION BY OUR COMPANY MGRS MAKES THE PLTS LESS LIKELY TO CALL IN FATIGUED. IF WE ARE FATIGUED; WE ARE PUNISHED BY HAVING OUR PAY DOCKED. IN THE FUTURE; I PLAN ON BEING MORE PROACTIVE WHEN MANAGING FATIGUE. ANYTHING OVER 12 HRS ON DUTY AND WE ARE ASKING FOR TROUBLE.