Left Trap bigger than right

I'm right handed too, and I've had problems with my right bicep, and quads being bigger than my left; but in this case, its the oppositte. My left trap is wayy bigger than my right. I'm thinking its because I play guitar a lot-- meaning i have a guitar strap over my left shoulder/trap for a while. That could be why. Should I just do some db shrugs on my right side?
 
Its not neccessarily bigger...you have an elevated shoulder balde on your left side that gives the perception of a bigger trap. Its a major imbalance and probably due to your guitar playing posture.
 
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