PLT OF SMA APCHING FOE HAD NMAC WITH ANOTHER SMA IN TFC PATTERN.

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'FOLLOW THE Y ON FINAL.' SINCE I WAS ON FINAL AND IN A Y. I THOUGHT HE WAS REFERRING TO ME; AS I WAS GOING TO ARRIVE SOON. SLOWING APPROPRIATELY FOR THE DISTANCE. AT ABOUT 4 MI OUT I WAS PREPARING TO ANNOUNCE MY 3 MI FINAL. STILL LOOKING FAR AHEAD FOR THE PLANE ON L BASE WHEN I SAW ANOTHER PLANE LNDG; AND THEN QUESTIONED WHETHER THERE WAS ANOTHER Y ON FINAL AT THE SAME TIME AS ME. I THEN SAW THE PLANE ON L BASE; WHICH WAS ON L BASE WAY OUT THERE AND ON A COLLISION COURSE WITH MY PLANE. I HAD PLENTY OF TIME TO EXECUTE A STEEP TURN AND TURN 180 DEG TO OUTBOUND COURSE. I ANNOUNCED MY TURN AND THE REASON WHY; ALTHOUGH MY TERMINOLOGY WAS NOT STANDARD; I THINK I FINALLY MADE SENSE WHAT HAD HAPPENED. I ASKED FOR INSTRUCTIONS AND WAS TOLD TO FLY TOWARD THE S END OF THE FIELD. I WAS THEN SE OF THE ARPT AND BTWN RWYS 3 AND 31; HDG W. THE TWR TOLD ME TO MAKE A R BASE TO 21; WHICH IS IMPOSSIBLE FROM THERE; AND I REFUSED THE CLRNC; TOLD THEM WHY AND REQUESTED NEW INSTRUCTIONS. THE CTLR TOLD ME AGAIN TO MAKE A R BASE TO 21; AND I TOLD HIM AGAIN THAT WAS NOT APPROPRIATE FOR MY PRESENT POS. HE THEN REALIZED WHAT I WAS SAYING AND AUTHORIZED A L BASE FOR 31. HE LATER APOLOGIZED FOR HIS CONFUSION. ONCE ON THE GND I FOUND A LETTER IN THE FBO SAYING ATC TRAINING WAS BEING CONDUCTED AND TO REFUSE INAPPROPRIATE CLRNCS. IF I HAD MADE SUCH AN ERROR I SUSPECT MY LICENSE WOULD BE SUSPENDED. MY SUGGESTIONS ARE FOR SUCH A HIGH DENSITY ACFT ACTIVITY FOR A NON-RADAR ARPT TO PUBLISH A STANDARD ARR PROC THAT WOULD SIMPLIFY THE ACFT SEQUENCING; AND TO PLACE EXPERIENCED CTLRS IN CHARGE AT THE TIME; AND RESERVE TRAINEES TO ROUTINE TFC. IF IT WAS AN EXPERIENCED CTLR; THEN NEITHER PROBLEM SHOULD HAVE OCCURRED.