I'm not a religious person, but I'm a fan of the St. Francis quote, "at all times preach the gospel, and only when necessary use words". -our actions in life carry all the weight. If you're interested in changing the world, just start with yourself. I know it's cliche, but it is literally the only thing you will ever have complete control over.
I have a friend, ill call him cW, that once said "I run to change the world." He goes on to say,
Granted, I don’t change much of it, at least not all at once. But in another sense, I change every bit of it, in an instant — abracadabra-style. I change the world by changing myself.
Be the change. -cliche, but true.