No, he will not outgrow this behavior. Dogs don't OUTGROW behavior, they are outTRAINED behavior. I put it in bold not because I'm yelling at you, but because I want to make it very clear that there is an important distinction there.
Out of curiosity, why did you get a puppy? Why a german shepherd?
I don't understand what your dog does all day - it sounds like he is only 13 wks old and already living outside by himself or in the utility room. He needs training (CLASSES), stimulation (PLAYTIME and TRAINING) and exercise (PLAYTIME, TRAINING, WALKS, FETCH, etc...)
You can not possibly expect to bring a 13 wk old drivey dog such as a shepherd out into a living room at night after being locked away all day or by himself in the backyard (he doesn't run laps all day exercising, trust me) and expect him to la quietly on a dog bed and chew on a toy, do you? Or gently play with a puff ball (aka the lap dog puppy)?
I am sad to imagine the future,