The English Wikipedia has about 30,000 active editors (as of 2013). We range from niche editors who build articles in a particular subject area, to "WikiGnomes" who work quietly formatting pages and tying up loose ends, to vandal fighters who monitor recent changes and revert bad edits, to reviewers who help run Wikipedia's peer review processes, to administrators who clean up messes and block disruptive editors, to policy wonks who analyze how Wikipedia works and discuss ways to improve it—and many more roles.
What we have in common is that we care—often very deeply—about Wikipedia. Although we come from different perspectives (and often disagree!) we're all here to try to make Wikipedia better.
Don't be shy! The great thing about Wikipedia is that you can make friends by asking questions and inviting other editors to help and collaborate!