A C152 STUDENT PLT LNDG STRAIGHT IN TO RWY 4 AT FD39 EXPERIENCES AN NMAC WITH A PA34 ON A STRAIGHT IN THAT HAD OVERTAKEN HIS ACFT.

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I WAS ON A SOLO XCOUNTRY FLT FROM NAPLES TO OKEECHOBEE. AT APPROX XA24 I CALLED 10 MI SW OKEECHOBEE FOR A FULL STOP RWY 4; STRAIGHT-IN. AT APPROX XA27 I CALLED 6 MI OUT INBOUND STRAIGHT-IN APCH RWY 4 OKEECHOBEE. APPROX XA27 I RECALL HEARING ANOTHER ACFT CALLING 12 MI SW 2500 FT INBOUND FOR A STRAIGHT-IN APCH RWY 4; OKEECHOBEE. JUST AFTER THIS; I RECALL HEARING SENECA NXXXX CALLING 8 MI S FOR A STRAIGHT-IN APCH TO RWY 4 OKEECHOBEE. AT APPROX XA30 THE INCIDENT: I CALLED 2 MI FINAL ESTABLISHED FOR RWY 4 STRAIGHT-IN APCH OKEECHOBEE. I WAS AT 700 FT AT 80- 85 KIAS; 10 DEGS FLAPS. I LOOKED UP AND OUT OF NOWHERE I WAS OVERTAKEN BY THE SENECA NXXXX. HE WAS ABOVE ME AND TO THE R AT APPROX 50 FT. THE SENECA THEN CONTINUED ON FINAL APCH TO RWY 4 FOR A TOUCH-AND-GO. HE REMAINED IN THE PATTERN AND JOINED L TFC. NOT UNDERSTANDING WHY THE SENECA NXXXX HAD OVERTAKEN ME AT APPROX 50 FT VERT SEPARATION AND 2 MI FROM RWY 4 WHEN I HAD BEEN RPTING MY POS AT 10 MI; 6 MI; AND 2 MI. I THEN CALLED SHORT FINAL RWY 4 OKEECHOBEE AS THE SENECA WAS TOUCH-AND-GOING ON RWY 4 OKEECHOBEE. THE SENECA NXXXX NEVER ACKNOWLEDGED MY POS AND I CONSIDER THIS TO BE A FLT SAFETY RISK; THIS IS WHY I AM FILING THIS RPT. AT APPROX XA31 I MADE A 65 KIAS FULL FLAPS APCH TO RWY 4 OKEECHOBEE AND ONCE LANDED I CALLED UNICOM CLR OF ACTIVE RWY OKEECHOBEE. I THEN CALLED UNICOM TWICE TO ASK FOR TAXI INSTRUCTIONS. I TAXIED TO THE RAMP AND SHUT DOWN MY ENG AT APPROX XA35. THE SENECA NXXXX REMAINED IN THE PATTERN FOR 3 CIRCUITS.