STUDENT PLT AT SWO INTERPRETS TWR INTERACTIONS TO HOLD SHORT AS A CLRNC INTO POS AND HOLD.

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WHEN I WAS READY TO MAKE AN INITIAL CALL TO GET PERMISSION FOR TKOF; I ALREADY SAW AN ACFT ON FINAL APCH; SO I DECIDED TO WAIT UNTIL THE ACFT LANDED TO MAKE A CALL. AFTER SEEING THE ACFT LAND; I CALLED THE TWR TO GET PERMISSION FOR TKOF. IN RESPONSE TO THAT; THE TWR SAID; 'HOLD SHORT;' AND I REPLIED; 'HOLD SHORT.' HOWEVER; I MISUNDERSTOOD THE PHRASE 'HOLD SHORT' AS 'POS AND HOLD.' THERE WAS NO TFC VISIBLE ON FINAL. EVEN IF I SAID 'HOLD SHORT;' IN MY MIND; I FELT IT WAS CLRED FOR ME TO GO ON TO THE RWY; SO I ACTUALLY DID. A FEW SECONDS LATER; THE TWR CAME BACK AND SAID SOMETHING FAST I DID NOT UNDERSTAND CLRLY; BUT I REMEMBERED THE TWR SAYING; 'YOU ARE NOT CLRED FOR TKOF; GO BACK TO TXWY C.' THEN; I REALIZED I MADE A MISTAKE; SO I APOLOGIZED; THEN I CLRED THE RWY. AT TXWY C; I CHANGED THE FREQ TO THE GND CTL; THEN I CALLED THE GND CTL TO GET PERMISSION TO TAXI. THE CTLR SAID IF I WANTED TO GO BACK; OR TO TAXI TO THE RWY FOR ANOTHER TKOF; THEN I SAID 'I WANT TO TAXI TO RWY 4;' SO THE CTLR ALLOWED ME TO TAXI BACK TO RWY 4 AGAIN. AFTER GOING BACK TO THE RWY; I CALLED THE TWR; AND HE SPOKE SLOWLY TO ME. AFTER THAT; I DID NOT MAKE ANY MISTAKES; THEN I WENT ON THE XCOUNTRY FLT.