bro... you ain't straight.
You may not be "gay" but you being into trans girls means you have a more expanded sexuality than someone who only likes P in V sex.
And by the way - in no way is this a bad thing. It's a great, liberating thing, because you can admit to yourself that you like interesting, different things.
But, you can't be like "hey, I'm super into trans girls to the point I have studied their genitals and can discern the difference in quality" then drop a no homo on there.