RWY INCURSION BY THE PLT OF A LIGHT TWIN WHEN FAILING TO CLR RWY 12R IN TIME; TURNING THE WRONG DIRECTION AND CREATING THE NEED FOR A GAR FOR LNDG TFC AT HOU; TX.

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AFTER LNDG ON RWY 12R; I WAS ASKED WHERE I WAS PARKING AND REPLIED 'FBO' WHICH WAS TO MY L. I WAS INSTRUCTED TO TURN L ON TXWY K. HOWEVER; I WAS GOING TOO FAST TO STOP OR TURN AT TXWY K AND WAS THEN INSTRUCTED TO TURN ON TXWY L. LATER I WAS TOLD I WAS TO TURN R ON TXWY L. I DIDN'T HEAR THE INSTRUCTION TO TURN R; AND TURNED L (TOWARDS MY RAMP). THERE WAS AN A-36 SITTING ON THE TXWY L AND I HAD TO SLOW AND STOP FOR A SECOND TO PASS BY THE A-36 AND AT THAT TIME TOLD TO 'CLR THE RWY' BY THE TWR. AS I STARTED TO DO SO; I HEARD THE TWR SAY 'Z GO AROUND.' AFTER CLRING THE AREA; I WAS TOLD TO CALL THE TWR AND THEN INFORMED THAT I SHOULD HAVE TURNED R AND MY FAILURE TO DO SO HAD CAUSED AN ACR TO GO AROUND. I WAS TOLD THAT THEY WOULD CALL AND SEE IF THEY WISHED TO MAKE 'AN ISSUE' OF THE EVENT AND I WOULD BE CALLED BACK BY THE TWR AND TOLD OF THE OUTCOME. THE TWR CALLED BACK ABOUT 2 HRS LATER AND TOLD ME THE AIRLINE DROPPED THE MATTER AND THAT I NEEDED TO 'LISTEN UP' BETTER IN THE FUTURE. I BELIEVE THAT THE CAUSE OF THIS EVENT WAS MY FOCUS ON TURNING L TOWARDS MY RAMP; ESPECIALLY AFTER BEING TOLD TO TURN L AT TXWY. I NEED TO BE MORE CAREFUL IN LISTENING AND NOT ASSUMING WHAT I AM GOING TO HEAR. ALSO; HOWEVER; I THINK THE TWR WAS PACKING THEM IN A BIT TIGHT; AS I WAS ON THE RWY LESS THAN 1 MIN; BUT THAT IS NO EXCUSE FOR ME GETTING THE TAXI INSTRUCTIONS WRONG.