RWY INCURSION OF AN OCCUPIED RWY BY A STUDENT PLT IN A C150 AT SGF; MO.

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ON MAR/WED/02; I FLEW A C150 AT SGF FOR 1.9 HRS TO GO PRACTICE SOLO MANEUVERS; TKOFS AND LNDG. BECAUSE OF WX AND MY SCHEDULE IT HAD BEEN 13 DAYS SINCE MY LAST FLT. THE MAJORITY OF MY TRAINING HAS BEEN FROM SMALLER ARPTS. ALTHOUGH I HAD AUTH AND MY FLT OUT TO A DESIGNATED PRACTICE AREA WENT WELL; I NOW REALIZE A SMARTER DECISION WOULD HAVE BEEN TO TAKE A SHORT CHK RIDE WITH AN INSTRUCTOR TO REACCLIMATIZE TO COM IN THIS CLASS C ENVIRONMENT. I CALLED SGF GND CTL; TOLD THEM WHO I WAS; WHERE I WAS; AND WHAT I WANTED TO DO AND THEY GAVE ME CLRNC TO TAXI TO RWY 14. I HAD LANDED ON RWY 14 A FEW TIMES BEFORE WITH MY INSTRUCTOR; BUT THIS WAS MY FIRST TIME TAKING OFF FROM THIS RWY. RWY 2/20; WHICH I WAS MOST FAMILIAR WITH; IS CURRENTLY UNDER CONSTRUCTION. MY FIRST MISTAKE WAS NOT GOING ALL THE WAY TO THE BEGINNING OF RWY 14. INSTEAD I TURNED L AT TXWY H FOR AN INTXN TKOF. I HELD SHORT OF RWY 14 AND COMPLETED MY RUN-UP. GND CTL ASKED; 'WERE YOU WANTING THIS INTXN FOR DEP?' I ASKED IF THAT WOULD BE OK; AND THE REPLY WAS; 'THERE WILL BE A WAKE TURB DELAY FROM THE JET THAT WILL DEPART FROM THE END; UNLESS YOU ARE READY TO GO NOW.' I REPLIED; 'I AM READY TO GO NOW.' MY SECOND MISTAKE AS A STUDENT PLT WAS THAT I SHOULD HAVE JUST BEEN PATIENT AND WAITED. GND REPLIED; 'HOLD SHORT; TWR NOW 119.9.' I SOMEHOW MISSED THE 'HOLD SHORT;' DIDN'T READ IT BACK AND IN MY MIND I THOUGHT SHE SAID; 'CLRED NOW.' TO BE HONEST; THINGS HAPPENED FAST AND I CLRLY MISUNDERSTOOD. AT THE MOMENT IT DIDN'T REGISTER IN MY MIND THAT I NEEDED TO CONTACT TWR. IT HAPPENED SO QUICKLY. GND DID NOT CORRECT MY READBACK WITHOUT THE 'HOLD SHORT;' AND IN THE HEAT OF THE MOMENT; I WAS FULLY THINKING I HAD CLRNC AND NEEDED TO GET OUT OF THEIR HAIR. IN RETROSPECT; MISTAKE #3 WAS THAT I CERTAINLY SHOULD HAVE ASKED FOR CLARIFICATION WHEN I WAS NOT ABSOLUTELY POSITIVE WHAT I WAS TO DO. I LOOKED FOR TFC AND THINKING I WAS DOING THE RIGHT THING; PULLED OUT. GND THEN CAME BACK AND ASKED; 'ACFT X ARE YOU ON GND?' SURE ENOUGH I WAS; SO I REPLIED; 'SORRY; I AM ON GND.' 'CESSNA X YOU ARE SUPPOSED TO BE ON TWR; I SEE YOU ARE ON THE RWY; CLRED FOR TKOF RWY 14.' AT THAT POINT I HIT MY FREQ CHANGE BUTTON TO TWR 119.9 AND TOOK OFF. TWR ASKED ME TO TAKE A HDG OF 240 DEGS; WHICH I DID. THE NEXT FEW HRS OF COM AND PRACTICE WENT WELL. I HONESTLY DID NOT REALIZE THE EXTENT OF MY MISTAKE OF TOTALLY LEAVING TWR OUT OF THE LOOP UNTIL I RETURNED AND DISCUSSED MY ACTIONS WITH MY INSTRUCTOR AND THEN LISTENED TO THE TAPED RECORDING FROM GND CTL. I'VE PLAYED IT ALL OVER IN MY MIND COUNTLESS TIMES IN THE PAST FEW DAYS. THINKING ABOUT THE LIVES OF OTHERS AND MY OWN AND HOW VERY FORTUNATE I AM THAT NO ONE WAS HURT AND THAT THERE WAS NO COLLISION. I HAVE HAD A DREAM OF BECOMING A GOOD PLT SINCE I WAS A CHILD. NOW THAT THE OPPORTUNITY HAS FINALLY ARRIVED; MY PASSION FOR LEARNING SINCE THE FIRST OF THE YR AND MY EAGERNESS TO GAIN EXPERIENCE AND BECOME A GOOD PLT HAS ONLY INCREASED. I ASSURE YOU THAT AS A RESULT OF THESE MISTAKES; I HAVE LEARNED SOME VERY VALUABLE LESSONS. I AM CONFIDENT WHAT I HAVE LEARNED WILL NO DOUBT MAKE ME A MORE CAUTIOUS AND DILIGENT PLT IN THE FUTURE.