quick question ... really

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i have just finished building a psu for my headphone amp
it's transformer + rectifier bridge + regulator + caps
now, the - (minus) from the rectifier bridge is ground.
my question is: should I connect it to the mains earth or not? i'm asking this because i see most wall wart have only 2 pins ...
thanks
 
schematic
 

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that means I shouldn't do it, right?

i tried to power up the psu, but the fuse (2A fast) blows...
i have no idea what could it be, i'll try "debugging" each stage
shouldn't be errors in the schematic, i just copied from lm317 datasheet
 
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