ATX PLT OF SMA ACFT INADVERTENT TKOF FROM THE WRONG RWY AT LAN.

Narrative

I HAD JUST COMPLETED A CHARTER FOR A PAX WHO WAS ON A NARROW DEADLINE AND WAS IN A BIG HURRY; AND I EXPEDITED THE DROP OFF. I ALSO HAD A DINNER ENGAGEMENT AT HOME 20 MINS AFTER MY ARR THERE; SO I WAS IN A VERY RUSHED FRAME OF MIND. MY TAXI INSTRUCTIONS WERE INITIALLY TO HOLD SHORT OF RWY 6 TO RWY 10R; THEN WAS CLRED TO CROSS. I TAXIED OUT OF GA AND TURNED ON THE PARALLEL; THINKING I WAS PARALLELING RWY 10R. I KNOW THE SIGNS ARE THE REQUIRED TYPE BUT THEY DIDN'T GET MY ATTN. THERE IS A LOT OF SNOW PILED FROM RECENT SNOWS. I DID A GND VOR CHK; RUNUP; AND ANNOUNCED READY FOR DEP. I SAW THE THRESHOLD AND DID A ROLLING TKOF WHEN CLRED FOR DEP. I NOTICED THE DIRECTIONAL GYROSCOPE DIDN'T AGREE WITH RWY 10R BUT KNEW THE MECHANISM HAD BEEN STICKING SO I RESET IT TO 000 DEGS. ON CLBOUT; AT APPROX 200 FT AGL; I GLIMPSED AN INTERSECTING RWY RUNNING TO MY R. AT THAT POINT I REALIZED I HAD INADVERTENTLY DEPARTED RWY 6; NOT RWY 10R AS CLRED. I IMMEDIATELY TURNED AND PARALLELED RWY 10R AND FLEW AS DIRECTED FROM DEP. AT NO TIME DID ATC QUESTION MY TAXI OR POS PRIOR TO DEP.