Films must all have the same structure. All of this to guarantee box office bonanza, which of course it never does, but that's another discussion entirely.
Be very clear as to what your dream is. Nowadays it is fairly certain that 90 percent of all actors really just want to be rich and famous as the solution to all that ails.
It is a good motive, fame and money, as it is tangible and measurable. Being an artist is neither measurable nor tangible and certainly not a way to become rich.