CLOSE PROX GA SMA ENDING A SOLO CROSS COUNTRY AND A COMMUTER LTT IN TFC AT CMI.

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COMING IN FROM TERRA HAUTE (HUF); AFTER GETTING ATIS; I CALLED CHAMPAIGN APCH APPROX 30 MI OUT FROM THE SE FOR A FULL STOP LNDG. I WAS GIVEN MY SQUAWK CODE AND VECTORS AT THAT TIME FOR 14R. I WAS ENTERING A DOWNWIND FOR 14. APCH GAVE ME INSTRUCTIONS TO REMAIN AT OR ABOVE 2000 FT MSL (TFC PATTERN ALT AT CHAMPAIGN IS 1500 FT MSL). THE REASON FOR THIS WAS BECAUSE I WAS FLYING OVER TFC FOR 22R. SOMETIME JUST BEFORE THAT; THE CTLR APPARENTLY CHANGED ME TO BE CLRED TO LAND FOR 14L. I MUST HAVE ACKNOWLEDGED WITH A 'ROGER...' OR SOMETHING TO THAT EFFECT; FOR I DON'T RECALL HAVING SAID 'ACFT IDENT CLRED TO LAND ON 14L.' AFTER THAT; TWR INFORMED MY TFC WAS ABEAM THE NUMBERS ON A R DOWNWIND FOR 14R. THEY TOLD ME NOT TO PASS THROUGH FINAL FOR THEY WERE TO LAND ON 14R. AT THIS POINT I THOUGHT I WAS STILL INBOUND FOR 14R AND CLRED TO LAND; THEREFORE MY THINKING WAS 'SINCE I'M ON A BASE; THAT MEANS THAT THE OTHER TFC FOR 14R IS TO LAND AFTER ME. I BETTER NOT OVERSHOOT FINAL FOR 14R FOR THERE IS NO TIME.' UPON REALIZING THAT THE TFC (I INITIALLY THOUGHT WAS MY TFC ABEAM THE NUMBERS FOR 14R) THAT I SAW WAS ACTUALLY TFC FOR 22R; I RPTED TO TWR; 'ACFT IDENT LOST HER TFC.' THEY RESPONDED WITH A STATEMENT SOMEWHAT TO THE EFFECT OF THAT TFC BEING NO LONGER A FACTOR -- NOT IN THOSE EXACT WORDS. I WAS THEN GIVEN PERMISSION TO DSND BELOW 2000 FT MSL. SO I CUT THE PWR AND BEGAN MY TURN FROM BASE TO FINAL FOR 14R. APCHING 1100 FT MSL; A COMMUTER PLANE FLEW IN RIGHT UNDER MY R WING TO LAND ON 14R. I IMMEDIATELY WENT OFF TO THE R SIDE OF THE RWY TO GAR BEFORE THE TWR EVEN TOLD ME TO DO ANYTHING. AT THIS POINT TWR QUESTIONED WHETHER OR NOT I UNDERSTOOD TO LAND ON 14L AND TOLD ME NOT TO CLB ABOVE 1000 FT MSL ON THE GAR UNTIL ADVISED TO DO SO. I DON'T RECALL PERFECTLY; BUT I WAS THINKING THAT MAYBE THE REASON THEY KEPT ME BELOW 1000 FT MSL WAS BECAUSE THERE WAS EITHER A GAR ON 22R OR A TKOF FROM 22R AT THE SAME TIME. I BELIEVE THE PROBLEM IN THIS SITUATION OCCURRED WHEN THE RWYS WERE CHANGED FROM 14R TO 14L FOR ME TO BE CLRED TO LAND. I MUST HAVE NOT PAID ATTN TOO CLOSELY TO THE TWR SAYING 14L; SINCE APCH TOLD ME 14R. WHAT MIGHT HAVE BEEN DONE TO AVOID THIS SITUATION IS FOR TWR TO ASK WHETHER OR NOT I WOULD 'ACCEPT' 14L. SINCE I WAS ON SOLO; AND ANY STUDENT PLT AT THE FBO FLT SCHOOL IS NOT ALLOWED TO LAND OR TKOF FROM A TAXIWAY. IF SHE HAD INCLUDED THAT STATEMENT/QUESTION; SOMETHING MIGHT HAVE TRIGGERED ME TO ASK 'WHAT RWY AN I LNDG ON...OH! 14L THE TAXIWAY.' I THEN WOULD HAVE REQUESTED ANOTHER ONE.