My golden was like this when he was younger and up to about a month ago(he just turned a year at the end of May). I did obedience training with him continually for 9 months. He was just very high energy. As of last week he is no longer in his crate and he got his CGC today. He is a completely different dog and people can't believe he is just over a year and so calm and well behaved. He was more work then both GSD's put together. If you aren't in training classes I suggest you start and keep going, eventually it clicks.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD