It depends on what you mean by that.
Gender is not just about how we externally present (when that's part of how we do), it's also about how we think about ourselves. Since no one can read your mind, there are no barriers as far as your own thoughts and imagination goes.
In terms of how you present, certainly how you present yourself alone, in your own room, is a place where no one else is, unless you share a room. What you wear under clothing is another option.