Depression is a pervasive condition and not all people including doctors are able to handle it. I am sorry that you did not find help when you attempted to reach out. It is sometimes hard for others to validate what they themselves do not experience. I don't know how many times I have been told to just get over it and get on with life. Unfortunately it is not that simple. If you are still in school you might try to talk to a school counselor or school psychologist. Also I would try to see a different doctor who has a better grasp of what depression is like and how to deal with it.
It is your life and you can have a great life ahead. Please do not be ashamed and do not give up.