PA31 PLT TAXIING FOR DEP AT MDT CROSSED HOLD LINES FOR RWY 31.

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I WAS CLRED BY GND CTL TO TAXI FROM THE GA RAMP TO RWY 31. AS I WAS APCHING TXWY F ON TXWY A; I SAW A DHC8 STOPPED AT THE BEND IN THE TXWY BEFORE RWY 31; (WHERE I PRESUMED TO HOLD SHORT LINE TO BE) NOT REALIZING THAT THE HOLD SHORT LINE WAS ACTUALLY IMMEDIATELY FOLLOWING TXWY F; SO I CONTINUED TAXIING TO THE SPOT WHERE I PRESUMED THE HOLD SHORT LINE TO BE; (PAST THE ACTUAL HOLD LINE). GND CTL ASKED ME TO HOLD MY POS AS I WAS BECOMING AWARE OF THE ERROR I HAD MADE; AND CONTACT TWR. I CONTACTED TWR; AND ASKED THEM IF THEY WOULD LIKE ME TO MAKE A 180 DEGS ON THE TXWY AS I HAD MISSED THE HOLD SHORT LINE AND THEY SAID IT WOULD NOT BE NECESSARY. THE PROB AROSE BECAUSE I HAD A PRECONCEIVED IDEA OF WHERE THE HOLD SHORT LINE SHOULD BE. A CONTRIBUTING FACTOR AS THE MIL RAMP; WITH SPECIAL OPS C130'S THAT CAUGHT MY ATTN RIGHT WHERE THE HOLD SHORT LINES AREA. I DISCOVERED THE PROB WHEN I WAS APCHING THE TURN IN THE TXWY TO SEE NO HOLD SHORT LINES AHEAD; SO I REALIZED THEY MUST BE BEHIND ME. I WILL CORRECT THIS ACTION BY NEVER PRESUMING WHERE HOLD SHORT LINES ARE AGAIN; BUT I ALSO FEEL THAT GND CTL SHOULD POINT OUT NON STANDARD HOLD POINTS VERBALLY.