It was about a person who had no physical body of their own. Every day, they became different people and were able to act as that person for the day. They had no control of who they could be, and couldn't be the same person twice, or for longer than a day.
Could this be Every Day (2012) by David Levithan?
Every Day is about the story of A, a person who wakes up occupying a different body each day. As described by Frank Bruni of The New York Times, "A. doesn't have a real name, presumably because they don't have a real existence: they're not a person, at least not in any conventional sense, but they have a spirit, switching without choice from one host to the next and, for just 24 hours, replacing its consciousness with their own." A has their own memories, but they are also able to tap into the memories of the person whose body they are occupying.
Your question seems to have prompted DavidW to ask a similar question, but with more details. DavidW is obviously thinking of "The Safe-Deposit Box" in Greg Egan's short-story collection "Axiomatic" (1995), but your question is too vague to be sure of this.