The term proactive means more than you may realize. Here is a good explanation from Stephen Covey in The 7 Habits:
While the word proactivity is now fairly common in management literature, it is a word you won’t find in most dictionaries. It means more than merely taking initiative [emphasis added]. It means that as human beings, we are responsible for our own lives. [Which means that] our behavior is a function of our decisions, not our conditions. We can subordinate feelings to values. We have the initiative and the responsibility to make things happen.
Look at the word responsibility — “response-ability” — the ability to choose your response. Highly proactive people recognize that responsibility. They do not blame circumstances, conditions, or conditioning for their behavior. Their behavior is a product of their own conscious choice, based on values, rather than a product of their conditions, based on feeling.
Because we are, by nature, proactive, if our lives are a function of conditioning and conditions, it is because we have, by conscious decision or by default, chosen to empower those things to control us.
In making such a choice, we become reactive. Reactive people are often affected by their physical environment. If the weather is good, they feel good. If it isn’t, it affects their attitude and their performance. Proactive people can carry their own weather with them. Whether it rains or shines makes no difference to them. They are value driven; and if their value is to produce good quality work, it isn’t a function of whether the weather is conducive to it or not.
Reactive people are also affected by their social environment, by the “social weather.” When people treat them well, they feel well; when people don’t, they become defensive or protective. Reactive people build their emotional lives around the behavior of others, empowering the weaknesses of other people to control them.
The ability to subordinate an impulse to a value is the essence of the proactive person. Reactive people are driven by feelings, by circumstances, by conditions, by their environment. Proactive people are driven by values — carefully thought about, selected, and internalized values.
Proactive people are still influenced by external stimuli, whether physical, social, or psychological. But their response to the stimuli, conscious or unconscious, is a value-based choice or response.