BE33 PLT CROSSES RWY AT BMI WITHOUT A CLRNC.

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I CROSSED RWY 29 AT BMI WITHOUT CLRNC. THIS ERROR WAS CLRLY MY FAULT. I HAD COPIED ATIS INFO WHICH HAD STATED THAT THE ACTIVE RWY WAS RWY 2. AFTER HEARING THE ATIS AND BECAUSE I WAS NOT FAMILIAR WITH THE ARPT; I CONSULTED THE RWY DIAGRAM AND PLANNED MY TAXI RTE TO RWY 2. WHEN I CALLED FOR TAXI I WAS CLRED TO TAXI TO RWY 29 AT TXWY G AND INSTRUCTED TO FOLLOW A MITSUBISHI ON ANOTHER TXWY. I WAS EXPECTING CLRNC TO TAXI TO RWY 2 AND THAT IS WHAT I INTERNALIZED (IN ERROR). THE ACFT I WAS SUPPOSED TO FOLLOW WAS NOT IN SIGHT WHEN I RECEIVED THE CALL AND I WAS PROBABLY PAYING TOO MUCH ATTN TO FINDING THE ACFT TO FOLLOW RATHER THAN TO THE REST OF GND CTL'S INSTRUCTIONS. AS I ARRIVED AT TXWY G; THE ACFT I WAS FOLLOWING CONTINUED AHEAD (AND SWITCHED TO TWR FOR TKOF ALTHOUGH I DID NOT KNOW THAT AT THE TIME SINCE I WAS STILL ON GND CTL FREQ). SINCE I THOUGHT (IN ERROR) THAT I WAS CLRED TO RWY 2; I FOLLOWED TXWY G WHICH TOOK ME ACROSS THE ACTIVE RWY 29. THE TWR SAW MY ACFT XING THE RWY AND DIRECTED ME TO CONTINUE ACROSS. AFTER XING; THE TWR ADVISED ME THAT I HAD CROSSED AN ACTIVE RWY WITHOUT CLRNC AND AN ACFT HAD BEEN CLRED FOR TKOF. I BELIEVE THE TWR ACTED CORRECTLY AT ALL TIMES. I SAW THE SECOND ACFT TAXIING WHEN I CROSSED RWY 29 BUT HIS RTE TOOK HIM ONTO RWY 2 AND I ASSUMED HE WAS TAXIING S ON RWY 2 TO GET TO THE TKOF POS. THE OTHER ACFT DID NOT ROLL WHEN I WAS XING THE RWY. THE CAUSE OF THIS INCURSION WAS MY FAILURE TO PAY ATTN TO THE RWY ASSIGNMENT DURING THE TAXI INSTRUCTION. CONTRIBUTING TO THE PROB WAS MY EXPECTATION OF GETTING AN INSTRUCTION TO TAXI TO RWY 2 SINCE THAT IS WHAT I HAD HEARD ON THE CURRENT ATIS. ALSO CONTRIBUTING WAS MY MISPRIORITIZATION OF TASKS; PAYING ATTN TO FINDING THE ACFT TO FOLLOW INSTEAD OF FOCUSING ON THE RWY ASSIGNMENT. AFTER TKOF; I CHKED THE ATIS AND FOUND THAT THE TWR HAD UPDATED THE ATIS TO REFLECT RWY 29 AS THE ACTIVE. I DO NOT BLAME THE TWR; I ONLY MENTION IT BECAUSE ATIS WAS A FACTOR IN MY MENTAL PREPARATION AND MY EXPECTATION OF A RWY ASSIGNMENT. I HEARD WHAT I EXPECTED TO HEAR INSTEAD OF WHAT WAS ACTUALLY SAID.