Congrats on your new boy. GSD are an amazing breed and bind very strongly to their owner. But not all are cuddly dogs. So that's not abnormal.
Best thing you can do to build your bond is training. Classes, or on your own. But they thrive on structure and learning and working.
Lots of walks interspersed with training sessions will go a long way!
Good luck I know you guys will be best buds!!!
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