BE-33 PLT AND A CESSNA HAD LESS THAN LEGAL SEPARATION AFTER THE BE-33 PLT MISIDENTED THE RWY HE WAS CLRED TO LAND ON.

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I WAS APCHING ARPT FROM THE SE. I CONTACTED TWR AND WAS TOLD TO CALL 3 MI SE FOR A R BASE ENTRY TO RWY 6. AT 3 MI SE; I CALLED AND WAS TOLD TO WATCH FOR TFC ON L BASE FOR RWY 6. I TOLD TWR TFC NOT IN SIGHT. WHEN I FINALLY SAW TFC; IT WAS CLOSE OFF MY L WING ABOUT 300 FT BELOW ME. I WAS TOLD BY TWR THAT I HAD FLOWN THROUGH THE FINAL APCH COURSE; VERY CLOSE TO LNDG TFC; AND TO MAKE A L 180 DEG TURN AND ENTER FINAL FOR RWY 6. AN UNEVENTFUL LNDG WAS ACCOMPLISHED. AFTER THINKING ABOUT THE INCIDENT; I REALIZED WHAT HAD HAPPENED. I HAVE BEEN TO THIS ARPT MANY TIMES; BUT ALMOST ALWAYS FROM THE ENE USUALLY LNDG ON RWY 24. THIS TIME I APCHED FROM THE SE FOR A BASE ENTRY TO RWY 6. I WAS INTENT ON LOOKING FOR MY TFC AND MISTOOK RWY 14/32 FOR RWY 6/24. I WAS LOOKING AT THE WRONG RWY AND LOOKING FOR TFC IN THE WRONG PLACE. WHEN I SAW THE TFC; I THOUGHT HE WAS IN THE WRONG PLACE AND I BECAME CONFUSED; UNTIL THE TWR TOLD ME ABOUT FLYING THROUGH THE FINAL APCH COURSE FOR RWY 6. I REALIZE THAT ORIENTATION IS A FULL TIME JOB; ESPECIALLY WHEN FLYING IN THE PATTERN. WHEN I DIDN'T SEE THE TFC; I SHOULD HAVE CALLED THE CTLR AND ASKED FOR FURTHER DIRECTIONS. INCIDENTS LIKE THIS ARE NEVER FORGOTTEN; AND I'M SURE IT WILL BE ON MY MIND WHENEVER I FLY TO ANOTHER ARPT.