Watson, 25, opens up about her work with the United Nations in an interview for Vogue U.K.'s September issue.
"Part of me relaxed after I took on that position, it gave me a sense of belonging and purpose," Watson tells the mag.
The actress took on the role of ambassador in the summer of 2014 and gave an empowered speech at the U.N. that September, launching the HeForShe campaign. The campaign's goal is to motivate men and boys to push to end gender inequality.
"Everything clicked into place, in a way that it hadn't before. I understood what I'm here to do and knew where to channel all this energy that has been coming at me," Watson says. "I now feel this sense of peace. People say that I'm different since I did it."
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The actress, who studied at Oxford and Brown University, now juggles her role with the U.N. with her busy acting career.
Watson is currently filming Disney's live-action musical version of Beauty and the Beast, starring as the titular beauty Belle.
The September issue of Vogue U.K. will hit newsstands on Thursday.