I guess whatever makes you feel worthwhile is considered changing the world
(Well in your own lil ways)
For example Picking up a piece of trash and putting it in a trash can, so it can be picked up and thrown into a trash dump. Helping an old woman or a child cross the road, helping your neighbor off loading his/her shopping item from the car, assisting a colleague with his/her assignments.
Just being good and considerate to your parents, family and those around.
I guess whatever makes you feel worthwhile.

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Be the change you want to see in the World - Mahatma Gandhi
so true Arien.