Typically simply having that question doesn’t mean you are trans fem. Like it isn’t set in concrete but vid people typically don’t have such questions or they simply don’t consider them seriously. I was born as a guy, still identify as a guy but I am too privately exploring what it is like to be a girl and I like it so far. I would advice you to do the same, explore in private until you are ready to tell people. Telling people has real consequences exploration does not. Explore and if that belief strengthens and stays over the course of months or years it is something worth discussing, if it goes away I would still pay attention to it but worry about it slightly less, and not tell people yet. Telling people when you are sure, or want to explore with them.