PLT OF PA28 TAXIES ONTO ACTIVE RWY AT AN UNCTLED FIELD BTWN TFC JUST LANDED AND UNKNOWN TFC ON FINAL APCH. TO AVOID CONFLICT; TAKES OFF WITH PREVIOUSLY LANDED ACFT STILL ON THE RWY.

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I AM TRAINING TO ACQUIRE A COMMERCIAL PLT'S CERTIFICATE AND WAS DOING A SOLO FLT. I HAD JUST COMPLETED MY RUN-UP FOR TAKING OFF AT RWY 35. I HEARD A PLANE IN THE PATTERN MAKING RADIO CALLS OF DOWNWIND; THEN BASE; THEN FINAL. I WAS UNDER THE IMPRESSION THAT HE WAS DOING A TOUCH-AND-GO. ONCE HE LANDED; I MADE A RADIO CALL 'ARROW XXX TAXIING INTO POS RWY 35.' THEN I BEGAN TO TAXI TO THE BEGINNING OF THE RWY TO GET LINED UP WITH THE CTRLINE AND HOLD. I HAD SCANNED THE TFC PATTERN AND WAS UNAWARE OF ANYONE ELSE. WHEN I GOT TO THE EDGE OF THE RWY I STOPPED TO WAIT FOR THE RWY TO CLR. THEN I HEARD ANOTHER PLANE MAKE A RADIO CALL '(CALL SIGN) 2 MI FINAL.' I KNEW THAT I HAD PROBABLY CUT IN FRONT OF HIM AND DIDN'T WANT AN ACCIDENT TO OCCUR; SO I TOOK OFF TO GET OUT OF HE WAY. THE PLANE AHEAD OF ME WAS A WAYS DOWN THE RWY AND I WAS ABLE TO TAKE OFF WELL BEFORE HIM AND WAS ABOUT 200 FT ABOVE THE GND BEFORE I REACHED WHERE HE WAS. I ALSO SIDESTEPPED THE RWY. THE PLANE BEHIND ME MADE A CAL 'ARROW XXX; ARE YOU AWARE THAT YOU'RE NOT SUPPOSED TO TAKE OFF WITH ANOTHER PLANE ON THE RWY?' TO WHICH I REPLIED; 'YES; I'M SORRY; I WAS JUST TRYING TO GET OUT OF THE WAY.' ONCE I LANDED; I SPOKE TO MY INSTRUCTOR AND HE SAID HE HAD SPOKEN TO THE INSTRUCTOR IN THE PLANE AND HAD TOLD HIM WHAT HAD HAPPENED. I TOLD HIM THAT I KNEW THAT I HAD SCREWED UP AND THAT THE BEST THING TO HAVE DONE IN THAT SIT WAS TO STAY STILL AND LET THE GUY COMING IN ON FINAL GO AROUND IF I WAS READY TO TAKE OFF. I WASN'T A FACTOR TO THE PLANE LNDG BUT WAS AT A CLOSER DISTANCE TO THE PLANE ON THE GND. I HAVE LEARNED FROM THIS EXPERIENCE AND WILL BE MORE DILIGENT AND CAREFUL BEFORE TAKING OFF FROM A RWY.