C182 PLT HAD A RWY INCURSION AT SNA AFTER HE TAXIED ONTO A RWY AFTER BEING CLRED TO CROSS A RWY TO HOLD SHORT OF A PARALLEL RWY.

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THE ARPT WAS VERY BUSY WITH 11 ACFT WAITING FOR DEP. I WAS TOLD BY GND CTL AFTER LEAVING THE W SIDE TWR RUN-UP TO TAXI TO TXWY K AND MONITOR TWR 'THEY WILL CALL YOU.' I WAS THE FIRST PLANE HOLDING SHORT AT TXWY K ON THE W SIDE. AFTER ABOUT 5 MINS THE TWR CTLR ASKED 'ACFT X; IS THAT YOU IN FIRST POS?' I RESPONDED 'ACFT X HOLDING SHORT AT TXWY K.' IN THE BACK OF MY MIND I THOUGHT I SHOULD HAVE SAID W SIDE HOWEVER THE TWR WAS VERY BUSY. AFTER ABOUT 15 MINS THE CTLR SAID I KNOW YOU ARE THERE AND WILL TRY TO GET YOU OUT. ABOUT ANOTHER 5 MINS WENT BY AND THE CTLR SAID 'ACFT X CROSS RWY 19L HOLD SHORT RWY 19R. I THOUGHT HE WAS CLRING ME ACROSS THE R TO HOLD SHORT OF THE L SINCE I WAS AN E DEP. I CROSSED THE HOLD BARS AND NOTICED AN ACFT ON THE RWY IN POS AND HOLD AND ANOTHER ON THE OPPOSITE SIDE BLOCKING THE TXWY. I STOPPED AND TOLD THE CTLR I WAS TURNING AROUND. THE CTLR SAID DO A 180 DEGS AND I RESUMED HOLDING AT TXWY K. I WAS CLRED ACROSS ABOUT 10 MINS LATER AND DEPARTED ON RWY 19L. I BELIEVE THE PROB WAS DUE TO THE FOLLOWING FACTORS. 1) THE SUN WAS BEHIND THE TWR CAB AND MY AIRFRAME WAS 90 DEGS TO THE SUN. I HAVE LARGE N NUMBERS HOWEVER THE SUN MOST LIKELY OBSCURED THEM WITH THE REFLECTION OFF THE AIRFRAME. 2) I HEARD WHAT I WAS SUPPOSED TO HEAR NOT WHAT WAS SAID. 3) ORANGE COUNTY IS VERY BUSY AND THE FAA SHOULD MAKE A STAND ON UTILIZING FACILITIES LIKE EL TORO TO RELIEVE THE CONGESTION AT SNA.