If you have friends with dogs, ask if they know of a good trainer where they train you while you train the dog. If not get a recommendation from your vet. You need to break this behavior. Puppy needs to know you are the Alpha dog in the pack. Positive re-enforcement using small treats you can purchase at the pet stores when puppy is good. One thing if you need to is a pinch collar. I know some people think this is crule, but the trainers we used who are award winning trainers and have worked training police dogs around the world recommends them. I was resistant at first but it really made since when he explained it to us. A choke caller will "choke your dog and continures to tighten as a dog pulls against it. A pinch collar can only pull so tight because of the way it is designed and the barbs dig slightly into the dogs neck causing a pinching sensation the dogs hate. It worked well for our problem child.
If you know someone who has had this problem then maybe they can help you with how they broke this behavior. Good luck, puppys can be a handful. My first choice is find a good trainer to help you if you've not done it before.