The best way to begin to change the world is with your voice, put something in writing (your theory, idea, novel), tell every person you meet what you want to do. This is hard for me because I am very paranoid of people taking my ideas. However, as I have gotten older and have felt as if I am running out of time, I have started speaking up and I was amazed at how much people have offered, referred, and contributed to what I want to do. The best example I can use is Ghandi, Martin Luther King...Most who have changed the world in a real way have been very poor, overlooked, or misrepresented by the media. Those who you "think" have changed the world or who the media has put out there are usually front people for the people behind the scenes.
So NEVER pattern yourself after anyone or think that you have to do something big to change the world. You do NOT need money! All you need is a great idea and someone will give you money for it.