The world is fine and does not need to be changed.
However, it's up to each of us to take upon ourselves to make it a better place.
I like to think I do my best. I do take a lot of pride from a few things that I have done and that I know they helped young teens as well as some adults to live a better, happier and more enjoyable life. It's incredibly positive to have kids and teens come up to you and tell you that you made a difference.
But my own actions are limited. I don't do it for the pride & glory, I do it because I believe this is how I should live my life, positively influencing others.
In my own community, act as a "counter power" to mainstream media and uber materialistic way of life. It gives value to my mistakes and errors, by doing that and using my own experience to help out, I know my darkest hours were not all for nothing.
I don't believe the world has to be changed, I don't believe we (or the world, for that matter) need to be saved. I'm saddened that there is so much fear, hatred, anger and violence in the world. But I also understand that fear, hatred, anger, violence are a part of who we are.
We will never remove those from the world, but trying anyway is what makes us more than just animals.