I defer to my personality type when it comes to questions of my motivations. This is because I am an ENTJ according to the Myers Briggs Type Indicator. According to the Wikipedia page on this personality type:
ENTJs account for 1–3% of males formally tested and 1–2% of females. ENTJ types tend to be self-driven, motivating, energetic, assertive, confident, and competitive. They generally take a big-picture view and build a long-term strategy. They typically know what they want and may mobilize others to help them attain their goals. ENTJs are often sought out as leaders due to an innate ability to direct groups of people. Unusually influential and organized, they may sometimes judge others by their own tough standards, failing to take personal needs into account.
So yeah, I am female and I relate to this depiction.
E versus I = means I am an Extravert. I used to think I was an introvert because social (purely social) situations make me uncomfortable. But I am an extravert because I talk so that I can better understand what I am trying to communicate about. The words literally need to leave my head so that I can see them and reflect.
N versus S = means that I am Intuitive. I just know things more than I sense them.
T versus F = means that I am a Thinker. Logic drives me more than emotion.
J versus P = means that I Judge things more than I perceive them. Where this has meant in the past that people get the impression I don’t do things I don’t want to do, all it is, is me not wanting to do things I think are a bad idea.
This all means that my main motivation in life, is working on what I see around me. I don’t do it for approval, I don’t do it to avoid guilt or shame, I do it because solving problems and figuring out solutions, is life. A situation without responsibility, a job without authority is death for me. I need to feel engaged and the way I feel engaged, is by connecting with the world and its systems around me.