7 month old German Shepard

Question
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-----Question-----
I'm trying to figure out if my 7 month old shepard has a bad temperment?Whenever i walk him and he see's another dog he acts like he wants to attack them.I know he's still a puppy ,but this attitude he gets really has me worried.
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It is hard to sort out true aggression and puppy play.  Here is a link to a Shepherd I had enjoying having a Lab stay with us for a week, http://www.photolocker.net/images/Labman/gretchenandellaplaying.jpg  Have you done an obedience class?  Some classes and instructors are useless, but most would be able to sort out aggression and play.  Look for a class that is about you being top dog, not the dog getting a treat if it sits.  

If you are having trouble controlling her on lead, look into a head collar.  
The leading brands are Promise,  Haltie, and Gentle Leader.  They have a strap going around the dogs nose looking something like a muzzle.  They work by pulling the dogs head around.  No other way gives you such great control with so little force.  The prong collar is now a  dangerous relic of value only for its macho looks.  Do not consider using one without hands on instruction from somebody with plenty of experience with them.

I also have another problem with him.While im walking him he's always trying to get the leash out of my hand or he'll hold part of the leash in his mouth(kinda like he's walking me)plus he'll grab me by the sleeve or pant leg.I can barely move about the house with out him dragging me by pant leg.I dont know how to get him to stop he doesnt act like that to my b/f he's a very smart dog he sits,stays,fetches and comes by name its just when i'm alone with him.

Answer
OK your BF is giving him signals he is top dog, and you aren't.  The key to most behavior problems is approaching things using the dog's natural instincts. Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog.  Life is much easier if the 2 legged pack members outrank the 4 legged ones.  You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/  Also apply these rules, http://www.dogbreedinfo.com./topdogrules.htm