Most of us blog by ourselves. In a room, quietly in front of a computer. We can't actually see what happens on the other side of the screen, the people reading what we have to say, how they feel, how it affects them. Even if you have only one reader, your words may be the inspiration they need for the day. You never know.
We make our thoughts real just by publishing them. It can be powerful, and why not use that power to make the internet (and the world) a better place? Inspire your readers to explore or to stand up for themselves. Support the community with your words, and see what happens. You might be surprised by the joy you find in blogging.