STUDENT PLT OF AN SMA SEL BECAME CONFUSED DURING TAXI ON ARPT AND MADE AN UNAUTH RWY XING.

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TAXIING FROM PARKING SPACE BELOW TWR; CONTACTED GND AND RECEIVED CLRNC TO CROSS RWY 19R HOLD SHORT RWY 19L. CALLED TWR 2 TIMES; SAID I WAS HOLDING SHORT OF RWY 19L AND REQUESTED TO GO FBO EAST. SOME OTHER PERSON KEPT STEPPING ON MY XMISSION; SO I WASN'T AWARE IF THEY KNEW I WAS HOLDING SHORT RWY 19R. GND GAVE CLRNC TO CROSS RWY 19R TO FBO. I CALLED TWR AND SAID; WAS THAT XMISSION FOR ME? GND SAID GO; AND THEY KNEW WHERE I WAS AND THAT I WAS IN A CONFUSED STATE. XMISSION BEING STEPPED ON; I PROCEED TO CROSS TO TXWY C; I SAW THE TXWY C SIGN AND MISTOOK THE RWY 19L FOR TXWY C. ONCE ON RWY AND SEE MY MISTAKE; I EXIT THE RWY ASAP. ONCE AT FBO I WAS INFORMED TO CALL THE TWR; WHICH I DID; AND WAS TOLD WHAT I HAD DONE; AND ASKED WHY? I TOLD THEM I WAS A STUDENT AND I GOT CONFUSED WITH ALL THE ACTION AND PEOPLE TALKING ALL AT ONCE. THE TWR AT THE TIME DIDN'T KNOW I WAS STUDENT. I HAD NEVER TAXIED MY ACFT ALONE BEFORE. DID I LEARN ANYTHING FROM THIS? I SAID; YES AND UNDERSTAND HOW THIS COULD HAVE BEEN. IT DID HAPPEN AND I WILL LISTEN AND FOLLOW INSTRUCTIONS. LOOK BEFORE MOVING. MAKE SURE WHERE I AM GOING. WHERE I'M AT. WHO'S TALKING TO WHO!