PIPER PA28 PLT INADVERTENTLY BECAME DISORIENTED AND DID NOT FOLLOW ASSIGNED TAXI OUT RTE RESULTING IN XING A RWY WITHOUT CLRNC.

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AFTER GETTING CLRNC; WENT TO GND AND WAS TOLD TO TAXI RWY 27. I REQUESTED RWY 36 BUT SOMEONE ELSE CAME ON AND STATED RWY 27 WAS MORE IN LINE WITH DIRECTION OF FLT. I MISTAKENLY TAXIED TOWARD RWY 9 XING RWY 36 BECAUSE THE COMPOUNDING EFFECT ALSO HAD ME THINKING I WAS CLRED TO CROSS. THERE WERE SEVERAL CONTRIBUTORS TO THIS MISTAKE. I HAD FINISHED AN IMPORTANT ASSIGNMENT EARLIER THAT MORNING BY GETTING UP EARLY AND GOING TO CLIENT'S SITE. THIS GAVE ME ONLY 4 HRS REST. I WAS IN TOO MUCH OF A RUSH TO MEET AN XA30 DEADLINE IN VERO BEACH; MY DEST. MY HEAD WASN'T IN THE COCKPIT WHILE PERFORMING THIS TAXI OP -- IT WAS ELSEWHERE. GND CTL WAS CONFUSING WHEN I FIRST CALLED UP AND RECEIVED INSTRUCTION. I READ BACK 'TAXI RWY 27.' SOMEONE ELSE CHIMED IN REQUESTING READBACK OF RWY. WHEN I DID THAT HE ISSUED ANOTHER RWY. GUESS HE WAS HAVING A BAD DAY ALSO BECAUSE HE WAS THE ONE REFUSING TO GIVE ME RWY 36 WHICH IS MY NORMAL DEP RWY. FROM RWY 36; IT IS A SIMPLE CLBOUT OF CLBING R TURN TO JOIN V3 WHERE FROM RWY 27 IT'S A LONGER CLBING L TURN.