I want to say I don't think worrying about faking is something anyone really needs to worry about. The only people I've heard tell people they were faking is truscums (they've told me that for being NonBinary). IMO identification is valid, if you identify as trans it's enough, if you don't that's also valid, there's no minimum criteria you need to meet to be valid in your identity.
If you think you might be trans and are worried that you are faking it. You probably arnt faking it. People don't unintentionally fake being trans.
Besides, there is nothing wrong with thinking you are trans and changing when you find a new label which you feel is more accurate. What's important is that you feel comfortable with your decision. No one will persecute for thinking you are trans and changing your mind.