EXPERIMENTAL MUSTANG 2 PLT LANDED AT HGR AND TURNED OFF ON A RWY INSTEAD OF A TXWY.

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RPTING ON L DOWNWIND RWY 27; FLYING INTO HGR. THERE WERE NUMEROUS ACFT BEING CTLED BY RADIO ON THE TWR. I WAS TOLD TO EXTEND DOWNWIND WHILE 2 ACFT WERE CLRED TO FINAL. I WAS ASKED IF I HAD A VISUAL. I ANSWERED I DID NOT. I WAS CLRED FOR BASE AND THEN HAD TO ASK FOR FINAL HAVING FLOWN WELL PAST THE EXTENDED CTRLINE. AS THE LAST OF THE OTHER 2 ACFT IN FRONT OF ME LANDED I WAS GIVEN CLRNC TO LAND. OTHER ACFT WAS LNDG BEHIND ME AND I WAS TOLD TO TURN R ON WHAT I THOUGHT WAS RWY 2 AND CONTACT GND ON 'POINT 9.' I TURNED R ON THE FIRST TURNOFF (RWY 2) AND CONTACTED GND. I WAS CLRED TO TAXI: TXWY A TO TXWY B FOLLOWING A BOEING STEARMAN AND ANOTHER EXPERIMENTAL AND ALL THREE TO HOLD SHORT OF RWY 27. I READ BACK THEN AS I RECALL. GND CTL ASKED IN THE FUTURE TO EXIT RWY USING A TXWY. THIS IS WHERE I PERCEIVED THERE MAY BE A PROB. I WAS ASSUMING A R TURNOFF OF THE ACTIVE AT THE FIRST AVAILABLE SPOT AFTER ROLLOUT; DUE TO THE HIGH NUMBER OF ACFT LNDG. PERHAPS I MISUNDERSTOOD THE INSTRUCTIONS OR THE XMISSION WAS GARBLED DUE TO INTENSIVE TFC COMS. I NOW AM ASSUMING TWR INSTRUCTED ME TO TURN R TXWY C; WHICH WOULD HAVE BEEN THE NEXT R TURNOFF BEYOND THE ACTUAL TURNOFF ONTO RWY 2. CORRECTIVE ACTION AND HUMAN FACTOR: I SHOULD READ BACK ALL INSTRUCTIONS INVOLVING TAXI USING A RWY.