PA28 PLT INCORRECTLY ASSUMES INSTS ARE INCORRECT AND MAKES A WRONG ARPT APCH.

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UNDER VFR CONDITIONS; REQUESTED VECTORS FROM BEALE AFB FOR ILS 15 APCH; LHM. PREFLT BRIEFING/RANCHO MURIETTA REVEALED NO NOTAMS AND ILS 15 AT LINCOLN OPERATIONAL (108.75). FOLLOWING VECTORS; I INTERCEPTED OUTBOUND 108 DEG RADIAL MARYSVILLE VOR (110.8) PLANNING TO INTERCEPT CODEY INTXN WHEN LOC MOVED TO CTRLINE. (I DID NOT IDENT LOC AND MORSE CODE; BUT DID LISTEN TO LINCOLN AWOS 2 TIMES). I DID NOT INTERCEPT LINCOLN LOC; BUT CONTINUED ON (108 DEG RADIAL MARYSVILLE VOR 110.8) EVEN THOUGH MY LORAN AND HAND-HELD GPS REVEALED I PASSED THROUGH APCH. WITHIN 1-2 MINS AT 2000 FT; I IDENTED VISUALLY WHAT I THOUGHT WAS RWY 15 AT LHM -- EVEN THOUGH LOC NOW SHOWED YELLOW FLAG. AT APPROX 1 MI FROM THRESHOLD; RWY 16 SHOWED CLRLY AND TO MY HORROR; I REALIZED I WAS APCHING RWY 16L AT SMF ARPT. I IMMEDIATELY PERFORMED A SHARP TURN TO E; CLBED TO 2000 FT AND CALLED SAC TWR ON 119.1 AND INFORMED THEM OF MY MISTAKE. THEY GAVE ME A PHONE NUMBER TO TWR WHICH I CALLED AFTER LNDG AT LINCOLN 15 MINS LATER. THEY WERE AS UPSET AS I WAS HORRIFIED AND EMBARRASSED. APPARENTLY THEY WERE LNDG ACFT ON RWY 34L&R AND T-33 DOING PRACTICE APCHS. FORTUNATELY; THERE WERE NO ACFT IN VICINITY AT THIS TIME. THEY WILL NOTIFY FSDO. ALTHOUGH I HAVE APPROX 200 HRS OF INST TIME; I HAVE SCHEDULED INSTRUCTION AT STOCKTON -- CFII AND FAA SAFETY INSTRUCTION. I AM ESSENTIALLY A PERFECTIONIST AND DO NOT WANT TO EVER MAKE A MISTAKE AGAIN; ESPECIALLY ONE THAT COULD HAVE BEEN CATASTROPHIC.