@ chris
I absolutely agree with Darkevs. You must have the 100% commitment, support and backing of your parents. This is assuming that you live at home. If you are emancipated or in another living arrangement, you must accurately assess both your financial ability and the time requirements to raise, own and maintain a heathy, happy Doberman. Dobes are a very expensive breed to own. They also require a serious time commitment to be content dogs.
Another consideration is down the line. Are you planning on going to college. Have you thought about the potential hassle of trying find a place to live with a Doberman, if and when you move out on your own.
I am not saying this cannot be done. I had and American Eskimo as a young teen, who was my primary responsibly. He was a total pistol. I did have to re-home him at one point as I was moving out of state to go to school. Fortunately, we had a family friend who adored him and was very eager to give him a new home. It worked out really well. I was lucky. Many are not.
Just some food for thought....
John
Portland OR
Edit: I didn't catch your response before I posted this. For the most part. however, my comment still stands.