SMA PLT CONFUSED; TAXIES BEYOND HOLD LINE.

Narrative

ATW = RWY 29/11; AND D311 WITH TXWYS. WIND WAS 17 MPH AT 150. GND ADVISED TO TAXI TO RWY 21. TAKING THE SHORTEST RTE TO RWY 21 I WENT PAST MIDFIELD TXWY BUT THEN NOTICED THE TXWY TO RWY 21 SEEMED TO HAVE DIRT PILED NEAR IT; SO I STOPPED AND ASKED GND IF I COULD GET TO RWY 21 THIS WAY. GND ASKED IF I HAD ATIS AND I REPLIED NEGATIVE. WAS ADVISED THAT TXWY HAD BEEN CLOSED FOR 10 DAYS; TO DO A 180; AND TAKE A R. I DID SO AND TAXIED ON MIDFIELD TXWY; BUT I WENT PAST MY R TURN TO RWY 21 TXWY. I THEN STOPPED SHORT OF RWY 21. GND ASKED IF I HAD CROSSED THE YELLOW LINE AND I REPLIED THAT I HAD. GND ASKED WHAT I WAS DOING AND I SAID I WAS TURNED AROUND. AS I WAS STOPPED IN A HARD L INTO THE WIND I COMPLETED A 180 BACK TO RWY 21 TXWY. GND SAID IF I WANTED A MIDFIELD TKOF TO ADVISE. I DID NOT WITH A 17 MPH XWIND SO I MADE A L ON THE 21 TXWY TO THE END OF RWY 21. TKOF UNEVENTFUL. INCIDENT WOULD NOT HAVE OCCURRED IF: I HAD BEEN GIVEN THE ANTICIPATED RWY 11 WHICH WAS THE EASIEST TO GET TO; IF I HAD LISTENED TO ATIS SO THAT 1 'GOOF' WOULDN'T BEGET ANOTHER 'GOOF;' IF I HAD NOT 'ASSUMED' RWY 11 (150 WIND) AND HAD REPLANNED MY TAXI RTE; IF GND HAD ADVISED TAXI RTE.