Mechanical Engineering prepares you to be an actual engineer, where you take a test to register as an engineer. You will invent things and be a full engineer. Mechanical Engineering Technology...
Structural engineering is usually limited to the design of buildings and other structures. Mechanical engineering includes the same type of components but usually as part of a piece of equipment....
Mechanical is that branch of engineering which enables study of machine elements. Automobile deals with vehicles of all types, their design, construction and development phases.
There is an old joke: "What's the difference between civil and mechanical engineers? Mechanical engineers build weapons -- civil engineers build targets." Yuck yuck.
In reality civil engineering...