C152 TAXIING FOR DEP AT SFB TURNED ONTO ACTIVE RWY WITH TFC ON TOUCH AND GO DEP ROLL.

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ON THIS DAY; C152 CALLED FOR TAXI. HE WAS ISSUED TAXI TO RWY 27R AT 'R' INTXN; THE R SIDE OF TXWY B. PLT READ BACK INSTRUCTIONS CORRECTLY. FOR SOME REASON; PLT TURNED L ON B1; THEN R ONTO DEP END OF RWY 27R. UNFORTUNATELY; A PA44 WAS ON A TOUCH AND GO. THE PA44 HAD JUST STARTED HIS DEP; SAW THE CESSNA; ABORTED AND TURNED OFF THE RWY AT TXWY L. SUPPLEMENTAL INFO FROM ACN 597870: I CALLED GND. HE GAVE ME THE TAXI CLRNC: 'TAXI TO RWY 27R AT TXWY R; R SIDE OF TXWY B.' AFTER I READ IT BACK; I STARTED TO TAXI. BECAUSE I THOUGHT I'M SO FAMILIAR WITH ARPT; I DIDN'T PAY ATTN DURING TAXIING. I THEN TAXIED ACROSS TAXI B; TURNED R ON RWY 9L (BELIEVING THIS WAS TXWY B). GND DIDN'T STOP ME DURING MY TAXIING. DURING MY TURN TO THE RWY; I SAW THE RWY WHITE CTRLINE; AND I ALSO SAW TFC AT THE BEGINNING OF THE RWY WHICH WAS TAKING OFF. I STOPPED IMMEDIATELY AND THE OTHER ACFT ALSO STARTED TO SLOW DOWN. THEN I ADDED PWR TO GET CLR OF RWY AS FAST AS POSSIBLE AND THEN CONTACTED GND. IT'S MY RESPONSIBILITY TO PAY ATTN DURING EVERY PHASE OF FLT; BUT I DIDN'T.