A PLT ENTERED STL CLASS B AIRSPACE WITHOUT A CLRNC.

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VFR CONDITIONS. IDENTED LAMBERT RATHER THAN SPIRIT OF SAINT LOUIS; APCHED WRONG ARPT. WE WERE APCHING LAMBERT. SPIRIT CTL DETERMINED WE WERE APCHING LAMBERT AND GAVE US A XPONDER NUMBER AND DIRECTED US TO SPIRIT WITH VECTORS. MY ACFT HAS A BRAND X GPS. THE BRAND X GPS SET FOR A DIRECT FLT TO SPIRIT ARPT. THE INTENT WAS TO ARRIVE AT ST CHARLES VOR; WHICH WOULD POS ME W OF LAMBERT CLASS B AIRSPACE. WITHOUT REALIZING IT; THE GPS WAS PUTTING ME BACK ON THE ORIGINAL TRACK. WHEN THE GPS BROUGHT ME IN SIGHT OF LAMBERT; IT LOOKED LIKE SPIRIT WITH THE 2 PARALLEL RWYS RUNNING THE SAME DIRECTION. WHEN I ANNOUNCED MY POS I WAS SHOCKED WHEN SPIRIT TWR INFORMED ME THAT I WAS APCHING LAMBERT RATHER THAN SPIRIT. THE CTLR IMMEDIATELY VECTORED ME TO SPIRIT. HAVING HAD THIS UNFORTUNATE EXPERIENCE; WHAT WOULD I DO TO AVOID THIS FROM EVER HAPPENING IN THE FUTURE? I WOULD NOT USE A NAVAID THAT COULD TAKE ME THROUGH A RESTR AREA; AND WHENEVER AVAILABLE; USE CTLRS; FILE IFR (OR FLT FOLLOWING WHEN NOT CURRENT).