when you combine locus of control and proactivity you get

If you feel that you have control over your life, you have an internal locus of control. If, on the other hand, you feel that you are at the whims of fate, you have an external locus of control.

Locus of Control refers to the extent to which individuals believe that they can control events that affect them. Individuals with a high internal locus of control believe that events result primarily from their own behavior and actions. Those with a high external locus of control believe that powerful others, fate, or chance primarily determine events. Those with a high internal locus of control have better control of their behavior and tend to exhibit more political behaviors than externals and are more likely to attempt to influence other people; they are more likely to assume that their efforts will be successful. They are more active in seeking information and knowledge concerning their situation than do externals. The propensity to engage in political behavior is stronger for individuals who have a high internal locus of control than for those who have a high external locus of control.

The cast of Locus of Control - 2010 includes: Darren Nutting as Tommy Barrett Perlman as Kara

To me, people with internal locus of control are happier because they can exert control over their lives using their own internal criterion. External causes do not regulate their lives.