The question is not can you make a difference? You already do make a difference. It's just a matter of what kind of difference you want to make during your life on this planet.
Julia Butterfly Hill is an enviornmental activist and author who was known for her effort to protect a tree in California Redwood from being cut down. She lived on the tree for two years, and eventually succeeded in preventing the lumber company from cutting trees in the area. http://www.juliabutterfly.com/en/
I'm female, say nothing