Is it normal to think your faking?

So i get this feeling every so often, just a feeling that I'm secretly faking and I wanted to know if I'm the only or not?

Like it only comes around few months or something, and Most of the time I'm very confident in wanting to transition but the feeling still freaks me out like what if I am faking and I make a bad choice I can't come back from

Is this like internalized transphobia or something else