DOPAMINE single mindedness, focus, pursuing your goals.

 by pursuing certain behaviors--single-mindedly focusing on a project, for instance--a person might increase that dopamine drive.
goal-directed behavior (or the lack of it) tends to stand out as a major personality trait.

Put simply, some of us are motivated to pursue goals and others are not.

"When our dopamine system is active, we are more positive, excited, and eager to go after goals and rewards, whether it's food, sex, money, education, or professional achievement

people who are goal-directed are not only more motivated but are generally happier. have strong feelings of elation because you are moving toward achieving an important goal are biochemically based, though they can be modified by experience."