A C172 PLT BECAME CONFUSED DURING A XCOUNTRY AND LANDED WITHOUT CLRNC AT TUL.

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THIS WAS MY FIRST LONG XCOUNTRY AFTER TAKING MY PVT PLT CHK RIDE A LITTLE OVER A MONTH AGO; AND I HAVE ONLY FLOWN ABOUT 5-10 HRS SINCE. THIS INCIDENT HAPPENED RIGHT AFTER DARK. I WAS ON A XCOUNTRY FROM LONGVIEW; TX (GGG) TO WICHITA; KS (ICT). I DECIDED TO DIVERT TO TULSA. DUE TO THE TIME OF DAY; I DID NOT TAKE AS MUCH TIME TO PLAN THE NEW RTE TO TULSA AS I WOULD NORMALLY HAVE; BECAUSE I WANTED TO LAND BEFORE DARK. I FILED A FLT PLAN FROM GGG TO 1H6 (HARVARD YOUNG FIELD). I WAS WITH FLT FOLLOWING THE ENTIRE RTE. ONCE IN TULSA; I WAS ASKED BY APCH IF I HAD THE ARPT IN SIGHT. BY THIS TIME IT WAS DARK. I DID NOT SEE ANY ARPT BESIDES WHAT I NOW KNOW TO BE TULSA INTL. I DID NOT SEE ANY RWY LIGHTS; JUST A FLASHING GREEN/WHITE IDENT LIGHT. I RPTED I HAD THE ARPT IN SIGHT; AND ASSUMED IT WAS YOUNG FIELD. TWR CLRED ME TO CHANGE TO ADVISORY; AND I DID SQUAWK VFR; 1200; AND CHANGED TO YOUNG FIELD'S CTAF FREQ. AT THIS TIME I STILL DID NOT SEE ANY RWY LIGHTS. AS I WAS ON A DOWNWIND FOR WHAT I THOUGHT WAS RWY 17 AT YOUNG; I FINALLY SAW LIGHTS THAT WERE ON A CROSS RWY. I HAD RECENTLY FLOWN A SOLO TRAINING XCOUNTRY DURING TRAINING WHERE A RWY WAS ADDED TO A FIELD; AND THE ARPT DIRECTORY DID NOT SHOW IT. I FIGURED THAT RWY 8/26 WAS AN ADDED RWY THAT HAD NOT BEEN PUBLISHED; AS IN MY SOLO XCOUNTRY EXPERIENCE; AND WAS THE ACTIVE. I CONTINUED TO ANNOUNCE ON THE CTAF (FOR YOUNG) MY LOCATION IN THE PATTERN. ALTHOUGH I DID THINK IT WAS STRANGE THAT RWY 26 WAS AN ACTIVE RWY; AND HAD A VASI; AND I WAS SUPPOSED TO BE LNDG AT A SMALL ARPT; I DIDN'T REALIZE WHAT HAD REALLY HAPPENED UNTIL I HAD LANDED. AS SOON AS I LANDED I SAW LARGE BOEING BUILDINGS; AND I KNEW SOMETHING WAS WRONG. NOT LONG AFTERWARDS; SECURITY PULLED UP BEHIND ME; AND LET ME KNOW I WAS AT TULSA INTL. AFTERWARDS; I FOLLOWED UP BY TALKING WITH THE SECURITY; TWR; AND ASSISTING IN FILING PAPERWORK AT THE FBO. I HAD NOT USED THE GPS MUCH DURING TRAINING; AND WAS FAIRLY NEW ON THE GPS. I BELIEVE ONE OF THE CONTRIBUTING FACTORS IS THAT I DID NOT PROPERLY ZOOM THE GPS IN TO CORRECTLY IDENT TULSA INTL FROM YOUNG FIELD. I BELIEVE IF I HAD USED THE GPS PROPERLY; I WOULD HAVE PREVENTED THIS INCIDENT FROM HAPPENING. I ALSO BELIEVE UNFAMILIARITY WITH THE AREA; ARPTS/LOCATIONS ALSO CONTRIBUTED TO MY ERROR. FLYING AT NIGHT DISTORTS LOCATIONS; DISTANCES; ALTS; AND MAKES SMALLER ARPTS DIFFICULT TO SEE AND IDENTIFY. THE DIVERSION FROM MY PLANNED RTE OF FLT DUE TO WX ADDED TO THE WORKLOAD OF DECISION MAKING AS A NEW PLT. THE PRESSURE OF HAVING TO BE BACK AT WORK IN WICHITA THE NEXT DAY ALSO ADDED TO THE STRESS. I ALSO NEED TO SPEND TIME BECOMING FAMILIAR WITH THE GPS; FLY DURING DAYLIGHT HRS INTO UNFAMILIAR ARPTS/AREAS; USE A BACKUP NAVAID TO IDENT THE ARPT SUCH AS A VOR/DME; AND BECOME FAMILIAR WITH RWY LAYOUT. IF THE RWY DIRECTION DOES NOT MAKE SENSE; RETURN TO APCH. POSITIVELY IDENT RWY BEFORE LEAVING APCH. AS A RESULT OF THIS INCIDENT; I HAVE ALREADY AND AM PLANNING ON DISCUSSING ALL THE ACTIONS/LACK OF ACTIONS SURROUNDING THIS INCIDENT WITH A FLT INSTRUCTOR. I PLAN ON DISCUSSING THE EVENTS THAT LED UP TO THIS INCIDENT; AND WHAT I COULD/SHOULD HAVE DONE TO PREVENT THIS FROM HAPPENING. I ALSO PLAN ON STUDYING ALL FAR'S REGARDING AIRSPACE; FAILURE TO OBTAIN CLRNCS; AND ANYTHING ELSE THAT HAS A RELEVANCE TO THIS SIT.