PLT IN C172 IFR TO CHA RPTS ARPT IN SIGHT AND IS CLRED FOR A VISUAL APCH TO RWY 20. THE PLT WAS UNFAMILIAR WITH THE ARPT AND LINED UP ON RWY 15. THE CTLR REVECTORED THE PLT TO RWY 20.

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I WAS APCHING CHA FROM BOWLING GREEN ON V234 FOR A LNDG AT CHA. THE CTLR TOLD ME TO TURN L TO 100 DEGS. I RPTED THAT I HAD THE ARPT IN SIGHT. THE CTLR CANCELED THE COURSE CHANGE TO 100 DEGS. I HAD BEEN CLRED FOR A VISUAL APCH TO RWY 20; MY HDG WAS ABOUT 160 DEGS. I AM NOT FAMILIAR WITH THE CHA ARPT AND ASSUMED I WAS HDG TO RWY 20; BUT FAILED TO CHK MY COMPASS HDG. I WAS ON APCH TO RWY 15. I KNEW I WOULD BE MAKING ALMOST A STRAIGHT-IN APCH ON MY RTE FROM BWG ON V234. AT ABOUT 4 MI OUT; THE CTLR TOLD ME I WAS ON THE APCH TO RWY 15; TOLD ME TO TURN L TO 100 DEGS FOR RWY 20 AND WAS CLRED TO LAND ON RWY 20. AFTER LNDG; THE CTLR CALLED ME AND RPTED THAT THERE WERE 2 OTHER PLANES IN THE AIR ALSO MAKING AN APCH AND OUR SEPARATION WAS CLOSER THAN IT SHOULD HAVE BEEN. I NEVER SAW THE OTHER PLANES BUT I HEARD COMS FOR THEM AND KNEW WERE NEAR THE ALT. I EXPECTED VECTORS TO THE RWY; BUT DIDN'T RECEIVE ANY. IF I WOULD HAVE CHKED MY HDG SOONER I WOULD HAVE DISCOVERED MY ERROR. THE CTLR WAS POLITE AND COURTEOUS WHEN I WAS CALLED AND INFORMED OF THE SIT THAT EXISTED AS I HAVE RPTED. I DO NOT EXPECT IT TO BE RPTED AND PROBABLY NO NEED FOR THIS RPT; BUT BELIEVE I SHOULD SEND ONE JUST IN CASE IT IS.