Throughout the film, Marty has conflicts with himself because he does not have confidence in his talent for music; At the same time that he has problems against another (Biff) that humiliates to his family and makes the impossible life to him when it travels to the past. Also, he has the conflict against the world, because, the Libyan terrorists try to kill him causing him to travel to the time of his parents.
Marty does not exactly have clear goals because he is living things as they happen to him, but because of traveling in another era, he has