Sadly, that’s one only you are able to properly answer. That said, if you’re worried that you’re faking it,then you’re probably not faking it.
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.
Write an autobiography and sneak it onto a Florida library shelf. If it gets banned, then you’re officially trans!
Great idea! Too bad it’s already gonna fail at the point I mention I’m pan
Why would you be faking it?
What evidence do you have that you are trans?
What evidence do you have that you are cis?
Do you want to be trans?
Those are the starting questions?
Do you want to be trans?
If the answer to that question is not a very easy “absolutely not” then you probably are.
If the answer to that question is a very easy “absolutely not” the result is indeterminate.
May help to not worry about your gender and instead focus on what things you want or don’t want. Do you want HRT? Do you want to change things about your presentation (such as clothing) or suspect you might (in which case, try it out in private). Do you want to change your pronouns or name? If you could magically change your genitals (without the option of going back), would you? Would you be willing to go through surgery for it?
You don’t need to answer yes to any of those to be trans, but it might be easier to focus on concrete things like those than the nebulous thing of “what is my gender?”
This blog might help. It helped me back when I was questioning.
There is also That’s Gender Dysphoria, FYI if you haven’t read that.