BE58 PLT AND A PWRED HANG GLIDER HAVE AN NMAC IN 0A7 CLASS G AIRSPACE.

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I HAD A VISUAL CONTACT WITH THE ARPT ABOUT 2.5 MI ON L BASE RWY 32. WHEN I RPTED ARPT IN SIGHT; APCH CTLR ADVISED ME THAT THERE WAS TFC ABOUT 1.5 MI S OF THE FIELD. I MADE 2 RADIO CALLS TO NOTIFY MY LOCATION AND INTENTION WHILE I WAS LOOKING FOR THE TFC. I DIDN'T GET ANY RADIO CALL FROM THE TFC BECAUSE I WAS ON INCORRECT FREQ WHICH I DIDN'T KNOW. I JUST ASSUMED THAT THE TFC WHICH WAS A PWRED HANG GLIDER WAS NOT EQUIPPED WITH RADIO. IN FACT HE HAD AN OPERABLE 2-WAY RADIO AND WAS USING IT; WHICH HE DESCRIBED LATER ON. WHEN I WAS ABOUT 1 MI L BASE; HE WAS ABOUT 1/2 MI FINAL. I THOUGHT SPACING WAS ENOUGH WITHOUT KNOWING THAT HIS APCH SPD WAS 20 KTS; WHICH HE SAID LATER ON. WHEN I WAS ON THE 1 1/2 MI FINAL; HE WAS ABOUT 1/3 OF LNDG RWY. HE APPEARED TO ME THAT HE WAS FLYING LEVEL ALONG THE RWY. I THOUGHT HE WAS DOING A LOW APCH OR GOING AROUND. I DECIDED TO CONTINUE MY LNDG APCH BECAUSE I THOUGHT THAT 2 TFCS EXECUTING A GAR WITH NOT BEING ABLE TO MAINTAIN RADIO CONTACT IS MUCH MORE DANGEROUS. SOMEHOW I LOST VISUAL CONTACT WITH HIM ON FINAL AND I DON'T REMEMBER WHEN I EXACTLY LOST VISUAL CONTACT. MY BEST GUESS IS THAT SINCE I WAS SURPRISED ABOUT DIRTY CONDITION OF THE RWY SURFACE; I GOT IN TARGET FIXATION; ESPECIALLY CONCERNING POSSIBLE FLAT TIRE DURING TOUCHDOWN. WHILE I WAS BACK-TAXIING (NO TXWY) TO THE RAMP AREA; I SAW THE PLT AND PWRED HANG GLIDER. I WONDERED HOW HE COULD LAND BEFORE ME AND CLRED THE RWY AHEAD OF ME. WHEN I MET HIM AT THE RAMP AREA; I HAD TO TAKE ALL OF HIS ANGER. I KNEW THAT I DESERVED IT AND I APOLOGIZED FROM THE BOTTOM OF MY HEART. I COULD HAVE KILLED HIM. I STILL DON'T UNDERSTAND HOW I COULD PICK UP INCORRECT FREQ EVEN THOUGH I CHKED IT FROM ARPT DIRECTORY AND GPS. BOTH SOURCES SHOWED CORRECT FREQ WHICH IS 123.0 BUT SOMEHOW I GOT 123.9. THAT WAS MY FIRST MISTAKE. THE SECOND MISTAKE WAS MISJUDGEMENT ON SPACING DUE TO WAY SLOWER APCH SPD THAN I COULD POSSIBLY IMAGINE. THE THIRD MISTAKE WAS NOT INITIATING A MANEUVER TO HAVE ENOUGH SPACE. I THINK THAT IT HAPPENED BECAUSE I DIDN'T WANT TO FLY THE PATTERN IN UNFAMILIAR MOUNTAINOUS AREA IN SUCH HAZE CONDITION. THE LAST IS A TARGET FIXATION. I ADMIT THAT I MADE VERY CRITICAL MISTAKES AND WAS VERY UNPROFESSIONAL. I LEARNED A VERY SIMPLE FACT BY ENDANGERING OTHER PLT'S LIFE. HOWEVER; ONE THING I CAN SAY AT THIS MOMENT IS THAT SAME MISTAKE WILL NOT HAPPEN TWICE. FROM NOW ON; I WILL FLY THE PATTERN AS LONG AS THE WX PERMITS EVEN IF IT IS VISUAL APCH FOLLOWED BY INST FLT.