FLC OF ACR LTT ACFT INADVERTENTLY TAXIED TO RAMP AFTER LNDG WITHOUT CLRNC DUE TO MISINTERPRETING TWR COMMENT AFTER LNDG.

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AT DECISION HEIGHT I SIGHTED THE 'RABBIT' SO WE CONTINUED THE DSCNT. AT 100 FT I HAD THE RWY ENVIRONMENT; BUT JUST BARELY. WE WENT VISUAL AND DECIDED TO LAND. ON THE ROLLOUT; APCH ASKED IF WE HAD MINS AT LNDG TO WHICH I REPLIED 'AFFIRMATIVE.' HE RELAYED THIS INFO TO ACR; WHO WAS BEING VECTORED FOR THE APCH. THE CTLR WAS HANDLING 3 POS -- APCH; TWR; AND GND. HE HAD CLRED US TO LAND WHILE WE WERE STILL OUTSIDE THE MARKER AND AS OFTEN HAPPENS AT NIGHT; I EXPECTED HIM TO CLR US TO THE RAMP AND REMAIN ON HIS FREQ. WHEN WE CLRED THE RWY; I ASKED IF HE WANTED US TO STAY WITH HIM OR GO TO GND. HE JUST SAID 'FLT NUMBER; THANK YOU' AND CONTINUED TALKING TO ACR. FOR SOME REASON I INTERPRETED HIS RESPONSE AS A CLRNC TO TAXI TO THE GATE; WHICH OF COURSE; IT WAS NOT. MANY THINGS WERE AT WORK IN THIS SITUATION. I WAS UNDER TREMENDOUS PERSONAL STRESS. I HAD BEEN PRESSURED INTO WORKING THAT DAY WITH THREATS FROM CREW SCHEDULING. THERE WERE WORK RELATED STRESSES TO INCLUDE DISAGREEMENT ON REGS WITH THE CAPT. A TIGHT APCH AND THE FREAKISH BEHAVIOR OF THE GPWS. THERE WERE ASSUMPTIONS ON MY PART WITH REGARD TO ATC'S INTENTIONS. I EXPECTED TO BE CLRED TO THE RAMP ON HIS FREQ AND READILY INTERPRETED HIS VAGUE RESPONSE TO MEAN THAT.