WRONG RWY LNDG. UNAUTH LNDG.

Narrative

WHEN I LEFT ANC ON A SCHEDULED FLT; THE WX AT BET WAS VFR. ABOUT 15 MI OUT I LISTENED TO BET ATIS 900 THIN BROKEN 200 THIN BROKEN AND 10 MI VISIBILITY. I CALLED BET TWR 10 MI OUT; WAS TOLD TO RPT R DOWNWIND FOR RWY 36 (WIND 360 AT 8). 2 OTHER ACFT RPTED 10 MI OUT RIGHT AFTER I DID. I WAS ON TOP OF A THIN BROKEN LAYER AT WHICH I ASSUMED WAS THE 900 THIN BROKEN. I WAS AT 1500 FT TRACKING INBOUND TO THE BET VOR. I COULD SEE DOWN THROUGH THE THIN LAYER AND WAS OVER THE CITY ABOUT 2 NE OF THE ARPT. I GATHERED FROM OTHER TALK ON THE RADIO (TWR AND OTHER ACFT) THAT THE VISIBILITY HAD DROPPED TO 1 MI AND FOG. I RPTED 2 NE AND REQUESTED A SVFR CLRNC. WHEN I GOT MY SVFR CLRNC; I WENT DOWNWIND AND TURNED BASE AND DSNDED. THE WX WAS MOVING IN FROM THE N AND DOWNWIND TOOK ME S AND IN VFR CONDITIONS I DSNDED. I TRACKED INBOUND ON THE 180 DEG RADIAL OF THE BET VOR. I DIDN'T HAVE TIME TO FIND THE LOC AND TUNE IT; EVERYTHING HAPPENED FAST AND I WASN'T PREPARED FOR THE RAPID CHANGE IN THE WX. ABOUT THE TIME I DECIDED TO REVERSE COURSE AND GET OUT; I SAW THE VOR AND RWY OFF TO MY L. I KNEW THE VOR WAS NEAR THE N END OF THE FIELD; SO I; ON THE SPUR OF THE MOMENT; WITHOUT REALIZING MY CLRNC TO LAND ON RWY 36; I MADE A 180 DEG L TURN AND LANDED ON RWY 18. WHEN I WAS DOWN AND TAXIING CLR; I REALIZED MY MISTAKE. I DON'T EVEN KNOW IF THE TWR KNEW WHAT HAPPENED BECAUSE THE CAB WAS IN THE CLOUD.