CIRRUS SR22 PLT TAXIED INTO POS AND HOLD ON RWY 20R AT PDK WHEN HE WAS ONLY CLRED TO TAXI TO THE RWY BY GND CTL.

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I AM HUMBLED BY THIS MISTAKE; A RWY INCURSION. I TRY TO BE A CAREFUL PLT; I EVEN REVIEW THE PLT GUIDE TO RWY MARKINGS; AND HAVE THE GUIDE ON MY KNEE BOARD. IT IS THE FIRST TIME ANYTHING LIKE THIS HAS HAPPENED TO ME. WHAT HAPPENED: I MISHEARD AN INSTRUCTION TO TAXI TO RWY 20R AT PDK AS A CLRNC TO ENTER THE RWY AND HOLD. I REALIZED MY MISTAKE AS I WAS ENTERING THE RWY ENVIRONMENT. BY THEN; IT WAS TOO LATE TO STOP. WHAT PROMPTED THE REALIZATION WAS THAT I SUDDENLY RECALLED THAT THE CLRNC I HEARD WAS FROM THE GND CTLR; AND I WOULD NOT EXPECT A CLRNC TO THE ACTIVE RWY FROM THE GND CTLR. I CALLED THE TWR AND WAS READY TO MOVE QUICKLY IF REQUESTED. I EVEN ASKED THE TWR IF I NEEDED TO MOVE. I HAD LOOKED PRIOR TO ENTERING THE RWY AND DID NOT SEE AN ACFT LNDG; BUT WAS CONCERNED. TWR INDICATED THERE WERE NO ACFT ON APCH TO THE RWY; TO REMAIN IN POS FOR RELEASE. CONTRIBUTING FACTORS: I BELIEVE THAT I LET MYSELF BECOME DISTR AND RUSHED. MY IFR CLRNC WAS FOR RADAR VECTORS TO AN AIRWAY. I HAD CONSULTED THE CORRECT CHART PRIOR TO TAXI. DURING MY CHK AT THE RUN-UP AREA TO MAKE SURE THE CHART WAS AVAILABLE AND FOLDED IT TO THE PROPER SECTION. I COULD NOT LOCATE THE CHART AGAIN. IT FELT LIKE I TOOK A LONG TIME TO FIND AND RETRIEVE THE CHART. AS I FINISHED THE RUN-UP; GND CALLED AND ASKED IF I WAS DONE WITH THE RUN-UP. I REPLIED THE RUN-UP WAS DONE AND THEN CAME THE INSTRUCTION I DID NOT HEAR CORRECTLY. WX WAS NOT A FACTOR.