A PA34 PLT; TAXIING FOR TKOF AT PDX; LINED UP WITH THE RWY EDGE LINE INSTEAD OF THE RWY CTRLINE; RESULTING IN A RWY EXCURSION.

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ON MY TKOF ROLL FROM PDX; I HAD A PROP STRIKE. THAT NIGHT I WAS FLYING FOR AN FAR PART 135 CARGO OPERATOR. THE PROP STRIKE OCCURRED ON TKOF ROLL FOR MY RETURN FLT TO BFI; WA. ONCE CLRED TO TAKE OFF FROM RWY 28R; THE TWR INSTRUCTED ME TO TURN R DIRECT BTG VOR; CLB AND MAINTAIN 6000 FT. I SET MY INSTS FOR THESE INSTRUCTORS; WHILE TAXIING TOWARDS THE RWY CTRLINE. AFTER SETTING UP ON WHAT I BELIEVED TO BE THE CTRLINE; I APPLIED FULL BRAKES AND ADVANCED THE THROTTLES TO 30 INCHES MANIFOLD PRESSURE; AT WHICH TIME I CHKED MY ENG INSTS. ALL INSTS INDICATED IN THE GREEN ARC. I THEN ADVANCED THE THROTTLES TOWARDS 39 INCHES MANIFOLD PRESSURE WHICH WAS TKOF PWR SETTING WHILE RELEASING THE BRAKES. IMMEDIATELY AFTER RELEASING THE BRAKES; THE L ENG SPUTTERED/PARTIAL PWR LOSS. FOR SOME REASON UNKNOWN TO ME; I LOOKED DOWN AT MY L ENG OIL PRESSURE; WHICH WAS IN THE GREEN ARC. I THEN TURNED MY ATTN BACK OUTSIDE AND SAW A WHITE LINE WHICH I THOUGHT WAS THE RWY CTRLINE. MY EYES ONCE AGAIN TURNED TO THE MY ENG INSTS AT WHICH TIME I HEARD 2 OR 3 THUMPS OUTSIDE THE ACFT. AFTER FIGURING OUT WHERE I REALLY WAS; IN THE LIGHTS; I POSITIONED THE ACFT BACK ON THE RWY CTRLINE AND ANNOUNCED TO THE TWR THAT I WAS ABORTING MY TKOF. I ESTIMATED THE ACFT SPD TO HAVE BEEN 20-40 KIAS AT THE TIME OF IMPACT WITH THE RWY EDGE LIGHTS. I'M NOT SURE WHY I LOOKED DOWN AT THE INSTS INSTEAD OF MAINTAINING POSITIVE CTL OF THE ACFT OR WHEN I RETARDED THE THROTTLES. REVIEWING THE SIT AFTER THE FACT; IT MAKES SENSE TO ME THAT I CONFUSED THE RWY EDGE LINE FOR THE CTRLINE. I'M NOT EXACTLY SURE WHEN THE THROTTLES WERE RETARDED; BUT I THINK I DID IT AS I LOOKED DOWN AT THE OIL PRESSURE GAUGE. I THINK THERE WERE MANY FACTORS THAT LED TO THE SIT THAT OCCURRED THAT NIGHT. I WAS EXTREMELY FATIGUED FROM LACK OF SLEEP AND STUDYING FOR AN INTERVIEW THAT I WAS SUPPOSED TO FLY OUT TO THAT DAY. ADDITIONALLY; I MIGHT HAVE BEEN COMPLACENT BECAUSE THE WX WAS SO NICE. THE WX ON THE EARLIER FLT FROM SEATTLE WAS POOR WITH WINDS OF APPROX 180-220 DEGS AT 20 KTS GUSTING TO 25-30 KTS AND 4000 FT BROKEN TO OVCST. WHILE AT PDX; THE WX WAS CALM WINDS; UNRESTR VISIBILITY WITH CLR SKIES.