A PVT PLT IN A C172 TAXIES TO RWY 32L AT CCR WHEN HE HAD BEEN CLRED TO RWY 19R. A RWY INCURSION WAS PERFORMED IN THE PROCESS OF THE TAXI.

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FOR HARD TO UNDERSTAND REASONS; I DEVIATED FROM CLRLY UNDERSTOOD TAXI INSTRUCTIONS FROM GND CTL. I WAS CLRED TO TAXI TO RWY 19R. THIS WOULD MEAN A LONG; STRAIGHT TAXI DOWN TXWY E. HOWEVER; IN TOTAL ERROR; I TURNED R AT TXWY K; AS IF I HAD BEEN CLRED TO RWY 32L. I DID NOT REALIZE MY ERROR UNTIL I ENTERED THE RUN-UP AREA FOR RWY 32L. THEN I CALLED GND CTL; CONFESSED MY ERROR AND GOT NEW DIRECTIONS TO RWY 19R. BY USING THE WRONG TXWY AND GOING TO THE WRONG RUN-UP AREA I HAD CROSSED THE ACTIVE RWY (19R). HOWEVER; I DID CAREFULLY LOOK FOR TFC; IN THE AIR AND ON THE GND; AS I ALWAYS DO. THERE WAS NO TFC. I HAD WORKED HARD PRIOR TO THE FLT TO PLAN IN DETAIL AND FILE 3 VFR FLT PLANS. MY HEAD WAS FILLED WITH ROUTES; FIXES; TIMES; HEADINGS AND FREQS. WHEN I FINALLY STARTED MY TAXI DOWN TXWY E; AFTER LOTS OF PREPARATION; I MUST HAVE RELAXED AS I WATCHED A SMALL GROUP OF PEOPLE (AND A VEHICLE) SVC A HELI JUST TO THE W OF THE INTXN OF TXWYS E AND K. AT THE SAME TIME; I WAS LISTENING TOO ATTENTIVELY TO THE GND CTLR DEAL WITH 2 PIPER AIRPLANES ON THE GND SOMEWHERE; THAT HAD VERY SIMILAR (POSSIBLY IDENTICAL) LAST 3 DIGIT CALL SIGNS. AS HE SORTED OUT THE FACT THAT HE WAS DEALING WITH TWO DIFFERENT AIRPLANES; HE WAS ASSIGNING THEM TEMPORARY; VERY DIFFERENT CALL SIGNS. AS SOON AS I REALIZED THAT I WAS IN THE WRONG RUN-UP AREA; I CALLED THE GND CTLR AND TOLD HIM WHAT I HAD DONE. HE INSTANTLY UNDERSTOOD WHAT HAD HAPPENED. HE CONFESSED THAT HE HAD BEEN DISTRACTED (WITH THE 2 PIPERS) AND HAD NOT SEEN WHAT I WAS DOING. HE WAS AS SHOCKED AS I WAS. HE VERY FIRMLY ADMONISHED ME; 'NOT TO DO THAT KIND OF THING IN THE FUTURE.' I NEVER WILL.