A C152 PLT TAXIED INTO POS AS CLRED AT HPN. TWR CTLR TOOK EXCEPTION TO HIS INTERP OF THE CLRNC.

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I WAS HOLDING IN POS FOR TKOF ON TXWY A FOR DEP ON RWY 16 AT HPN. CALL SIGN XYZ. I WAS #3 FOR TKOF; STILL ON GND FREQ BUT MONITORING TWR FREQ ON RADIO #2. DUE TO FREQ CONGESTION ON TWR (118.575); DUE TO PATTERN TFC; LNDG TFC; INTXN TKOFS; ETC; I COULD NOT BREAK IN ON TWR FREQ TO TELL THEM WHO I WAS. I DECIDED TO WAIT UNTIL I WAS #1 FOR TKOF; BEFORE CALLING TWR. AS THE 2 PLANES IN FRONT OF ME FINALLY TAXIED ONTO THE ACTIVE RWY; I MOVED UP TO THE #1 POS BUT DUE TO CONSTANT RADIO CHATTER; WAS STILL NOT ABLE TO ANNOUNCE MYSELF. FINALLY DURING A PAUSE OF MAYBE 1 SECOND I FLIPPED TO TWR FREQ ON RADIO #2 TO CALL TWR. BUT BEFORE I HIT THE PUSH-TO-TALK SWITCH; THE TWR CALLED OUT TO THE ACFT HOLDING IN THE #1 POS FOR RWY 16 (ME) 'WHAT'S YOUR CALL SIGN?' (OR WORDS TO THAT EFFECT). I REPLIED 'XYZ.' HE SAID 'OK' OR 'THANKS' OR WORDS TO THAT EFFECT; THEN CONTINUED INCESSANT INSTRUCTIONS TO OTHER TFC. A SHORT TIME LATER; I HEARD TWR SAY 'XYZ; TAXI INTO POS AND HOLD; RWY ONE SIX.' I REPLIED BACK; 'TAXI AND HOLD; RWY ONE SIX; XYZ.' I TAXIED ONTO RWY 16 AND HELD IN POS. I SAT ON RWY ABOUT 60 SECONDS LOOKING OUT REAR WINDOW OF C152 AT TFC ON 1 MI FINAL GETTING CLOSER. AT ABOUT 1/2 - 1/4 MI FROM LNDG; THAT TFC CALLED A SELF-INDUCED GAR DUE TO TFC HOLDING ON RWY (ME). TWR TOLD THAT ACFT TO GO AROUND; THEN YELLED AT ME FOR BEING ON THE RWY. HE SAID 'I TOLD YOU TO TAXI UP TO AND HOLD SHORT OF RWY ONE SIX.' I APOLOGIZED AND SAID; 'I THOUGHT YOU SAID TAXI INTO POS AND HOLD ON RWY ONE SIX.' HE THEN CLRED ME FOR TKOF. I DIDN'T ARGUE AT ALL AND JUST FLEW BACK TO POU ARPT. AS FAR AS A RESOLUTION FOR THIS INCIDENT; I REALLY CAN'T HELP AT ALL BECAUSE I KNOW WITH GREAT CERTAINTY WHAT HE SAID. I BELIEVE THAT HIS WORKLOAD; RADIO CONGESTION; INTXN TKOFS; ETC; CAUSED HIM TO JUST FORGET ME AND WHERE I WAS. IF HE ACTUALLY DID SAY 'TAXI UP TO AND HOLD SHORT RWY ONE SIX' AND I ACTUALLY MISINTERPED THE INSTRUCTION; THEN I AM EXTREMELY EMBARRASSED AND MORTIFIED THAT I COULD HAVE MADE SUCH AN ERROR.