AN SMA SPI LANDED ON THE WRONG RWY.

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TWR CLRED ME TO LAND ON RWY 35L. I RESPONDED 'CLRED ON RWY 35L.' I THEN SET UP FOR A LONG FINAL FOR RWY 35R AND LANDED. WHILE ROLLING OUT; I REALIZED MY MISTAKE AS THE TWR CONFIRMED BY SAYING; 'NX; IS THAT YOU ON RWY 35R? TURN L ON TXWY A5.' SINCE I COULD ONLY TURN R ON TXWY A5; I TOLD THE TWR; 'TURNING R ON TXWY A5.' TWR TOLD ME TO CONTACT GND AND CALL TWR AS SOON AS THE PLANE HAD BEEN TIED DOWN. WHEN I CALLED THE TWR; THE WOMAN MENTIONED THAT SHE JUST WANTED ME TO BE AWARE OF HOW IMPORTANT CORRECT COM IS WITH ATC FOR A SAFE AND OPERABLE ARPT ENVIRONMENT. IT IS EVERYONE'S RESPONSIBILITY TO RPT IN A CLR AND UNDERSTANDABLE MANNER. I MENTIONED THAT THE TWR WAS VERY BUSY AT THE TIME OF THIS TRANSACTION AND I POSSIBLY COULD HAVE GOTTEN MIXED UP. SHE RELAYED THE FACT THAT; AS TIME GOES BY AND I BECOME MORE EXPERIENCED TALKING TO CTLRS; THE EASIER SAFE COMS WILL BE. AS FAR AS CORRECTING MY MISTAKE; I WILL BE MORE CONSCIOUS IN TERMS OF ORDERS GIVEN BY THE CTLRS AND MY CORRECT RESPONSE. I ADMIT I WAS FATIGUED AND NOT PAYING THE TWR MY FULL ATTN.