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First off, your friends' girlfriends are some b*tches!
I agree , that was a really nasty thing to say!
Looking at your traps. they look well developed...did you or do you work out? If so did you take any gear?
When they first appeared , did it start as a small and hard lump behind your nipple? If so it's Gyne.......if they were ternder too whilst growing.....if not it may just be fat.....
I am going with gyne as they are to big in proportion to your body just to be fat...
Good luck