PLT OF PIPER SENECA TAXIES BEYOND HOLD LINE AND TWR ISSUES ABORT CLRNC TO AN ACFT ON TKOF ROLL.

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I HAD JUST LANDED ON AND EXITED RWY 25. REQUESTED TO TAXI BACK FOR TKOF AND WAS CLRED TO TAXI VIA TXWY C AND TXWY J TO RWY 25. AS I TAXIED TOWARD THE RWY ON TXWY J; THE TXWY BECAME WIDER AND I FELT THAT I WAS TOO CLOSE TO THE RWY. I HEARD THE TWR GIVE TKOF CLRNC TO ANOTHER ACFT AT THAT TIME; JUST AS I WAS ABOUT TO VERIFY MY POS WITH THE GND CTLR; AND AS I CAME TO A FULL STOP. THE NEXT XMISSION WAS THE TWR TELLING THE OTHER PLANE TO ABORT THE TKOF; WHICH THEY DID WITHOUT INCIDENT. TWR THEN TOLD ME THAT I WAS PAST THE HOLD SHORT LINE AND INSTRUCTED ME TO MAKE A 180 DEG TURN AND TAXI BACK. AS I TURNED I COULD SEE THE RWY EDGE MARKING JUST AHEAD. I HAD TAXIED PAST THE HOLD SHORT LINE; BUT NOT ONTO THE RWY ITSELF; WHICH SEEMED TO BE ABOUT 30-40 FT APART. I NOTICED AS I TAXIED BACK THAT THE HOLD SHORT LINE WAS NOT PARTICULARLY EASY TO SEE IN MY HEADLIGHT; BUT I COULD SEE IT. THE TWR THEN CLRED THE OTHER AIRPLANE TO TAXI BACK FOR TKOF; AND GAVE ME TKOF CLRNC. THE OTHER PLANE (A BUSINESS JET) TOOK OFF SHORTLY AFTER I DID. I TRIED TO FIGURE OUT WHY I HAD MISSED THE HOLD SHORT LINE THE FIRST TIME ACROSS. I DON'T RECALL BEING PARTICULARLY DISTR. I HAD RECEIVED MY CLRNC EARLIER AND WAS WAITING UNTIL THE HOLD SHORT LINE OR RUNUP AREA TO SET UP FOR THE DEP. THERE MAY HAVE BEEN SOME OTHER DISTR WHICH I DON'T RECALL. THE HOLD SHORT LINE WAS EASIER TO SEE FROM A DISTANCE IN THE LNDG LIGHT THAN AT CLOSER RANGE; AS I TAXIED BACK ACROSS IT.