SMA PLT BECOMES DISORIENTED AND TAKE OFF ON WRONG RWY.

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ON APR/XA/01; I WAS CONDUCTING A VFR XCOUNTRY FROM MY HOME BASE OF DOWNTOWN PARKS ARPT IN ST LOUIS TO SBN TO EVV AND BACK TO PARKS. WHILE I WAS APCHING; EVV APCH TOLD ME TO EXPECT RWY 36. I WAS SET UP FOR A DOWNWIND FOR RWY 36. WHEN I WAS PASSED TO EVV TWR; THE CTLR INITIALLY CLRED ME FOR LNDG ON RWY 4. I ADVISED THAT I WAS SET UP FOR RWY 36; SO HE CLRED ME TO LAND ON RWY 36. I LANDED; TAXIED TO THE FBO AND REFUELED. I OBTAINED A VFR CLRNC AND WAS TOLD TO TAXI BEHIND ANOTHER ACFT TO RWY 4. WHILE I WAS DOING MY ENG RUN-UP CHK; THE ACFT IN FRONT OF ME WAS CLRED FOR TKOF ON RWY 4. I HAD MY HEAD DOWN AND DID NOT PAY ATTN TO WHERE HE HAD TAKEN OFF. I WAS CLRED FOR TKOF ON RWY 4. I CROSSED THE HOLD SHORT LINE AND TURNED L. I WAS ON RWY 4; BUT I WAS CONFUSED BY MY SURROUNDINGS. I CONTINUED TURNING L THINKING I HAD NOT REACHED THE RWY. I TURNED ABOUT 40 DEGS AND LINED MYSELF UP FOR WHAT I THOUGHT WAS RWY 4; BUT WAS ACTUALLY RWY 36. THINGS LOOKED FAMILIAR HERE AND I REMEMBERED THAT I HAD BEEN CLRED TO LAND ON RWY 4 WHEN APCHING. I FORGOT THAT I HAD ACTUALLY LANDED ON RWY 36 AND THAT WAS THE REASON MY SURROUNDINGS HAD LOOKED FAMILIAR; I PROCEEDED TO TAKE OFF ON RWY 36 THINKING IT WAS RWY 4. AT ABOUT 200 FT AGL; I LOOKED TO MY R AND SAW THE MARKINGS FOR RWY 22. THIS WAS WHEN I REALIZED I HAD TAKEN OFF THE WRONG RWY. A FEW SECONDS LATER THE TWR CTLR CALLED ME OVER THE RADIO AND SAID 'ACFT X; YOU WERE CLRED FOR RWY 4 AND YOU DEPARTED RWY 36. WERE YOU AWARE OF THIS?' I REPLIED THAT I HAD JUST REALIZED WHAT I HAD DONE. HE ASKED ME WHAT MY DEST WAS AND WHERE MY HOME BASE WAS LOCATED. I TOLD HIM THAT I WAS HEADED TO ST LOUIS DOWNTOWN ARPT WHICH WAS ALSO MY HOME BASE. I RECEIVED NO FURTHER CONTACT FROM HIM IN THE AIR OR BACK ON THE GND AT DOWNTOWN PARKS. I WAS HANDED OFF TO EVV DEP AND FINISHED THE FLT. THIS WAS DUE TO THE FACT THAT I WAS OFFERED 2 DIFFERENT RWYS AND WAS TOO BUSY TO THINK CLRLY WHEN I GOT DISORIENTED BEFORE TKOF. IN THE FUTURE; I PLAN TO BE MORE AWARE OF WHERE I AM AT ALL TIMES AND TO ALSO HAVE AN ARPT DIAGRAM ON HAND. THIS SHOULD PREVENT AN INCIDENT LIKE THIS FROM HAPPENING TO ME AGAIN.