PLT OF AN MO20C TAXIED ONTO THE RWY WITHOUT CLRNC. GND CTLR CATCHES THE ERROR.

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I CALLED GND PRIOR TO MOVEMENT ON RAMP AND WAS GIVEN A VFR CLRNC TO READ BACK. READ BACK OK. PRIOR TO ENTERING TXWY I RECONFIRMED 'AM I CLR TO TAXI TO RWY 22.' GND REPLIED CLRED TO TAXI TO RWY 22. I UNDERSTOOD THIS TO BE A CLRNC TO TAXI TO RWY 22 AND WAIT FOR 'CLR TO DEPART.' I WAS NOT TOLD TO HOLD SHORT OF RWY 22 AND TAXIED TO RUN- UP AREA FOR ACFT RUN-UP AND THEN ONTO RWY 22 AWAITING DEP CLRNC. GND CTLR ASKED WHAT I WAS DOING AND I REPLIED I UNDERSTOOD YOU CLRED ME ONTO RWY 22; BUT NOT TO DEPART. HE SAID 'NO ONLY TO RWY 22 NOT ONTO.' I STARTED TO TAXI CLR OF RWY 22. HE SAID NO STAY THERE AND AWAIT DEP CLRNC; WHICH I DID. I MISUNDERSTOOD HIS TAXI TO MEANING AS HE DID NOT SAY 'HOLD SHORT OF RWY 22.' THIS COULD BE A POTENTIALLY DANGEROUS SIT. AS A HELI PLT; PRIMARILY; WE SELDOM USE RWYS OR TXWYS AND HAVE BEEN TO SRQ SEVERAL TIMES IN THE PAST AND FOUND CTLRS TO BE EASY TO WORK WITH. AS A NEWLY MINTED FIXED WING PLT I CAREFULLY LISTEN TO ALL TAXI INSTRUCTIONS DUE TO MY LOW EXPERIENCE. I WOULD EXPECT A 'HOLD SHORT' INSTRUCTION IF A CTLR WANTED THIS. EVEN THOUGH NO OTHER TFC IN THE AIR OR ON THE GND WAS AFFECTED BY THIS; THESE SITS MUST BE AVOIDED FOR EVERYONE'S WELL-BEING. I WILL NOT PERMIT THIS CONFUSION TO ARISE AGAIN AND HOPE OTHERS WILL LEARN BY THIS SIT.