JS32 CREW HAD A RWY INCURSION AT STL DUE TO PLT CONFUSION WITH ATC INSTRUCTIONS AND TAXIING TOO FAST.

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WE WERE TAXIING FOR DEP. TAXI INSTRUCTIONS WERE TO CROSS RWY 12R AT TXWY E; TURN L ON TXWY P AND R ON RWY 6. RWY 12R WAS THE ACTIVE FOR LNDG AND RWY 12L FOR DEPS. ONE OF OUR COMPANY ACFT WAS HOLDING SHORT OF RWY 12L ON TXWY C. I WAS UNSURE OF WHAT THE CTLR WAS TRYING TO ACCOMPLISH. WHEN I TURNED R ONTO RWY 6; I CROSSED A HOLD LINE FOR RWY 12L. CONTRIBUTING FACTORS WERE THE FACT THAT I DON'T OPERATE REGULARLY AT STL; TAXI INSTRUCTIONS WERE RATHER COMPLEX; AND THE CTLR ISSUED A BARE MINIMUM OF INSTRUCTION. ADDITIONALLY; I BELIEVE SOME CTLRS ARE INCREASINGLY CREATING A CLIMATE THROUGH IMPATIENCE AND INTIMIDATION WHERE PLTS HESITATE TO QUESTION INSTRUCTIONS. IN THE FUTURE; IF I HAVE THE SLIGHTEST DOUBT CONCERNING TAXI INSTRUCTIONS; I WILL STOP THE AIRPLANE AND ASK QUESTIONS UNTIL I AM SATISFIED. IN THIS CASE; I DID ASK FOR CLARIFICATION; BUT THE CTLR ONLY REPEATED HIS ORIGINAL INSTRUCTIONS WITH NO EXPANDED EXPLANATION AND I ATTEMPTED TO COMPLY IN THE INTEREST OF EXPEDITING THE FLOW OF TFC. SUPPLEMENTAL INFO FROM ACN 617569: AS SOON AS I SAW THAT HOLD LINE; I INFORMED THE CAPT WE WERE SUPPOSED TO HOLD SHORT; AT WHICH TIME HE SLAMMED ON THE BRAKES AND WE STOPPED. HOWEVER; WE HAD ALREADY CROSSED THE LINE. CONTRIBUTING FACTORS WERE: I (FO) WAS RUNNING CHKLIST; TAXIING TOO FAST; NO UNDERSTANDING THE END RESULT ON THE CLRNC; FATIGUE; A NEW FO AND A CAPT THAT DOES NOT FLY MUCH IN STL.