BE35 INCURS RWY AT SMF WHEN WANTING TO MAKE ADDITIONAL ROOM FOR AN OPPOSITE DIRECTION C208 ON TXWY.

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AFTER PREFLT I RECEIVED/COPIED ATIS AND RECEIVED A CLRNC FROM GND CTL. BOTH CLRNC AND GND CTL WERE ON THE SAME FREQ DUE TO THE LATE HR. I HAD ALSO QUEUED (TUNED) THE TWR IN ON THE SECOND RADIO. GND CTL ADVISED TO PROCEED TO RWY 34L. I DID THE RUN-UP ACTIVITIES WHILE TAXIING TO RWY 34L. WHEN I ARRIVED AT THE INTXN OF TXWY A; I COULD SEE NO RUN-UP AREA. I BELIEVE I AGAIN CONTACTED GND TO VERIFY I WAS TO PROCEED TO RWY 34L; WHICH WAS CONFIRMED. I THEN NOTED ANOTHER ACFT FACING ME; 25-50 YDS AWAY. HAVING PROCEEDED DOWN TXWY A; THINKING I WAS HOLDING UP THE FLOW OF TFC; I PROCEEDED TOWARD THE DIRECTION OF RWY 34L. MY THOUGHTS WERE TO DOUBLE CHK THE RUN-UP ACTIVITIES CHKLIST IN THE RUN-UP AREA BEFORE TAKING OFF. THERE WAS NO RUN-UP AREA. I CHKED THE RADIOS AND SAW I HAD TWR DIALED IN AND THOUGHT I HAD TALKED TO TWR; BUT DID NOT REMEMBER HAVING BEEN CLRED INTO POS. I THOUGHT I'D BETTER CHK WITH TWR; SO I TAXIED TO THE L SIDE OF THE TXWY; MAKING ROOM FOR THE OTHER ACFT; WHICH I THEN REALIZED WAS A CARAVAN; TO PASS WHILE I CHKED WITH TWR. WHILE WATCHING FOR THE CARAVAN; I TURNED BACK TO THE TXWY AND REALIZED I HAD JUST STARTED/PASSED OVER THE RWY HOLD SHORT MARKER. I CONTACTED 'TWR' IMMEDIATELY TO DETERMINE IF I HAD BEEN CLRED TO HOLD ON RWY 34L. I WAS IMMEDIATELY INFORMED I WAS STILL ON GND FREQ AND IT WAS THEN I REALIZED MY ERROR. I WAS INSTRUCTED TO RETURN TO THE GA BUILDING AND PHONE IN. MY CONTACT INFORMED ME THAT I MIGHT BE HELD RESPONSIBLE FOR A RWY INCURSION; AND THAT THERE WAS THE POSSIBILITY OF SOME ACTION TAKEN DUE TO MY ACTIVITIES. IT WAS DARK. I WAS UNFAMILIAR WITH THIS DEP PROC (RWY 34L) AND THOUGHT I WAS FOLLOWING INSTRUCTIONS. MOST OF MY ACTIVITIES OVER THE YEARS AT SMF WERE RWY 16 DEPS; WHERE THERE IS A RUN-UP AREA; AND USUALLY DURING DAYLIGHT OPS.