PLT OF C182 CLRED FOR BACK TAXI ON LNDG RWY ON THE FIRST LNDG WHEN PRACTICING LNDGS BEGINS TAXI BACK ON SECOND LNDG. TWR REQUESTS HIM TO EXPEDITE SINCE THERE IS LNDG TFC.

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I WAS DOING NIGHT LNDGS AT MHT. THE FIRST WAS TO A FULL STOP ON RWY 24. AFTER LNDG; I STOPPED ON RWY AND TOLD TWR CTLR THAT I WANTED TO TAXI BACK FOR MORE FULL STOP LNDGS. HE HAD ME DO A 180 DEG TURN ON THE RWY AND TAXI BACK TO INTXN A AND HOLD ON THE RWY W OF RWY 35 WHICH IS AN INTERSECTING RWY. HE THEN CLRED ME FOR TKOF FROM INTXN A ON RWY 24. AT L DOWNWIND MIDFIELD; I CALLED TWR AND WAS CLRED FOR THE OPTION. I LANDED ON RWY 24; STOPPED; DID A 180 DEG TURN AND STARTED BACK-TAXIING. THE CTLR TOLD ME TO EXPEDITE MY BACK TAXI TO INTXN A SINCE THERE WAS TFC ON SHORT FINAL TO RWY 24. WHEN I WAS CLR OF THE ACTIVE; THE CTLR ASKED WHAT I WAS DOING SINCE HE HAD NOT CLRED ME TO DO A BACK TAXI WITH THE 180 DEG TURN. THINKING BACK; HE WAS CORRECT HE HAD NOT CLRED ME. I FEEL THAT THE SIT OF THE FIRST LNDG SET THE STAGE FOR MY MISSING THE SIT ON THE SECOND. SINCE I RECEIVED THE CLRNC ON THE FIRST LNDG I FELL INTO THE TRAP OF REACTING THE SAME WAY ON THE SECOND. THE CLRNC FOR A 180 DEG TURN BACK TAXI FROM THE FIRST LNDG STUCK IN MY HEAD FOR THE SECOND. I NEED TO MAKE SURE THAT EVERY LNDG IS TREATED AS A SEPARATE OCCURRENCE AND BE MORE ALERT FOR CLRNCS.