My Left Bicep Smaller Than My Right Bicep ??

[BoxingGorilla]

It happens to everyone, ICB. Whichever side is dominate is doing more work.

You need to do some extra work using just your left arm. Various dumbell curls should do the trick. Another angle to take is doing some dumbell curls with your right arm first to weaken it and then do barbell curls so that your left arm has to pick up the slack for your right.