C172 EXPERIENCED CLOSE CALL AT PRC WHEN TURNING FINAL TO A PARALLEL RWY.

Narrative

I HAD JUST TAKEN OFF AFTER DOING A TOUCH AND GO; AND ANOTHER CESSNA HAD JUST TAKEN OFF RWY 21L AND TURNED XWIND JUST AFTER I HAD TAKEN OFF. TWR CALLED AND SAID; 'FOLLOW THAT CESSNA X;' SO I REPLIED; 'FOLLOWING THAT CESSNA X;' FOLLOWING THE C172 AFTER TWR HAD TOLD ME TO. WE WERE BOTH ON DOWNWIND AND I WAS FOLLOWING THE CESSNA IN FRONT WITH MORE THAN A SUFFICIENT AMOUNT OF DISTANCE BTWN HIM AND I. TWR CALLED AND SAID; 'FOLLOW THAT TFC Y.' I RESPONDED BY SAYING 'FOLLOWING THAT TFC Y.' AFTER ABOUT 20 SECONDS TWR RESPONDED ONCE AGAIN BY SAYING; 'FOLLOW THAT TFC; DO YOU HAVE THE TFC IN SIGHT; Y.' CLR TOUCH AND GO RWY 21R;' I RESPONDED; 'TFC IN SIGHT; CLR TOUCH AND GO RWY 21R.' FINALLY; HE TURNED BASE I WAS STILL ON MY DOWNWIND; AFTER HE TURNED FINAL I BEGAN TO TURN BASE. ONCE I WAS ABOUT LINED UP WITH RWY 21R I TURNED FINAL. WHILE THIS WAS HAPPENING I THOUGHT THAT THE OTHER CESSNA WAS LINED FOR RWY 21L. AS SOON AS I TURNED FINAL I SAW THAT THE OTHER CESSNA BEGAN TO GET ABOUT 100 FT FRONT OF ME AND WAS ABOUT 50 FT LOWER THAN ME; I REALIZED THERE WAS SOMETHING WRONG; SO I WAS ABOUT TO CALL THE TWR AND TELL THE OPERATOR THAT I WAS GOING TO GO AROUND; BUT HE CALLED AND ASKED; 'WHAT RWY ARE YOU LINED UP FOR.' I REPLIED; 'RWY 21R X.' THEN TWR RESPONDED; 'GO AROUND X.' I RESPONDED BY SAYING 'GOING AROUND X; TWR IS IT OKAY IF I GO BTWN THE 2 RWYS;' TWR SAID 'CLR TO DO SO X;' SO I DID AND THAT WAS THE END OF THE ORDEAL. AFTER THE GAR I CLBED UP TO 6000 FT AND DID ONE TOUCH AND GO AND LANDED.