PA24 PLT HAS A RWY INCURSION AT PVU.

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I WAS INSTRUCTED TO TAXI TO RWY 18. THERE WERE NO HOLD SHORT INSTRUCTIONS GIVEN I BELIEVE AND THAT WAS PROBABLY BECAUSE I WAS JUST TAXIING AS NORMAL TO A RUNUP AREA WHICH IS USUALLY WELL MARKED WITH A HOLD SHORT LINE. I BEGAN TO TAXI. IT LOOKED LIKE THE TXWY WAS NEWLY LINED AND REPAVED AND IN FRONT OF ME. I HAD THE RWY DIAGRAM IN FRONT OF ME MAKING SURE I WAS FOLLOWING THE RIGHT TXWY -- AT LEAST IT LOOKED RIGHT. I LOOKED UP FROM THE DIAGRAM TO SEE MYSELF PASSING THE DOUBLE BARS OF A RWY STOP AREA -- LEADING TO RWY 18. AT THE SAME TIME THE GND CTLR FROM PROVO TWR CALLED AND SAID TO STOP. I DID. MY STOP WAS JUST MAYBE 10 FT BEYOND THE HOLD SHORT BARS. HE TOLD ME TO TURN AROUND. I DID. THERE WAS A LNDG ACFT APCHING RWY 18 WHICH I SAW AS I WAS TURNING THE 180 DEG TURN. AFTER I PASSED THE HOLD SHORT LINES. I STOPPED AND ASKED IF I COULD PROCEED DOWN THE PROPER TXWY. IT IS CONFUSING BECAUSE IT LOOKS MORE LIKE A PARKING AREA THAN A TXWY. THE CTLR SAID I COULD PROCEED. I DID. I THEN TAXIED TO THE BEGINNING OF RWY 18 AND DID MY RUNUP. I THEN RECEIVED A 'CLRED FOR TKOF' FROM THE TWR AND ALL PROCEEDED UNEVENTFULLY AFTER THAT. ABOUT 3 MINS OUT AFTER TKOF; THE CTLR GIVE ME A NUMBER TO CALL WHEN I ARRIVED AT MY DEST. I DID CALL AND I SPOKE TO THE CTLR WHO ACTUALLY TOLD ME TO STOP ON THE TXWY. I THANKED HIM FOR HIS ALERTNESS. HE SAID THIS TYPE OF PROB HAS BEEN HAPPENING AND THEY WERE CONCERNED.