C150 PLT ENTERS TFC FOR WRONG ARPT AND HAS A NEAR MISS.

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WHILE FLYING A C150 TO GKY; I DEPARTED THE AIRSPACE OF ZFW TO THE S OVER RBD. I THEN TURNED EASTWARD; TOWARD ARLINGTON. I SAW WHAT I THOUGHT WAS THE CORRECT ARPT AND CALLED UNICOM FOR AN ARPT ADVISORY. I WAS ADVISED THAT L TFC WAS IN USE FOR RWY 16. I MANEUVERED FOR A 45 DEG ENTRY TO L DOWNWIND FOR RWY 16; THEN TURNED DOWNWIND. UPON TURNING DOWNWIND; I SAW THE RWY NUMBERS FOR RWY 35. THIS ALERTED ME THAT I WAS NOT AT GKY; BUT WAS IN FACT AT GPM. SEEING MY PROX TO THE CLASS B AIRSPACE; I BEGAN A CLBING 180 DEG R TURN TO AVOID ENTERING CLASS B AIRSPACE WITHOUT A CLRNC. AT THE SAME TIME; I TUNED THE RADIO TO GPM'S TWR FREQ; SO AS TO ESTABLISH CONTACT WITH THE FACILITY WHOSE AIRSPACE I HAD ACCIDENTALLY ENTERED. I LOOKED UP TO CLR THE AREA; AND SAW A HIGH WING ACFT APCHING ME HEAD-ON. HE WAS BELOW ME; AND WAS ON A WIDE L DOWNWIND FOR RWY 17 AT GPM. WITH LITTLE DANGER OF COLLISION; I TURNED L AND CLBED MORE TO GIVE HIM MORE ROOM; BUT HAD VERY LITTLE TIME TO GIVE HIM ANY MORE CLRNC; DUE TO OUR PROX. I THEN PASSED ABOUT 200 FT ABOVE; AND 100 FT HORIZLY FROM HIM. AFTER PASSING THE OTHER ACFT; I CALLED THE TWR TO ALERT THEM OF MY PRESENCE; AND TO APOLOGIZE FOR INFRINGING THEIR AIRSPACE. THE TWR ASKED IF I NOW HAD THE PROPER ARPT IN SIGHT. I DID; AND I ASSURED HIM SO. HE TOLD ME TO HAVE A NICE DAY AND THAT A FREQ CHANGE WAS APPROVED; SO I THEN ENTERED THE PATTERN FOR GKY ARPT AND CONTINUED SAFELY TO MY LNDG AT GKY. CONTRIBUTING TO THIS ACCIDENTAL INFRACTION OF AIRSPACE AND NEAR MISS; WERE 2 FACTORS: 1) THE PROX OF GPM AND GKY ARPTS. THE 2 ARE LESS THAN 3 MI APART; MEASURED FROM CTR-TO-CTR. 2) MY UNFAMILIARITY WITH THE AREA AND THE 2 ARPTS. I WAS AWARE; FROM MY PLANNING; THAT THERE WERE 2 ARPTS VERY CLOSE TOGETHER THERE. I DID NOT HAVE THE BENEFIT OF AN OPERATIVE VOR OR NDB/ADF; SO I WAS NAVING SAFELY BY PILOTAGE AT THE END OF THIS FLT. I HAD ATTEMPTED TO USE THE 2 BODIES OF WATER AROUND THESE 2 ARPTS TO BETTER TRIANGULATE VISUALLY AND ERRONEOUSLY DETERMINED THAT I WAS AT GKY ARPT; WITHOUT ACTUALLY YET HAVING IT IN SIGHT.