I have no idea how old you are, so I'll answer this as if you're past "first puberty."

Honestly, it shouldn't be a "height contest," its all about attitude! If you're confident with yourself, you come across as more male. And I don't mean like someone with "short person's syndrome," where every time someone says something, you want to fight them. I mean, self-confident in yourself and your actions. Trust me, you're not an impostor, simply a short man. There are plenty of short men, both celebrities and in history. Google is your friend in case you wish to look any up.
Try wearing clothes one size larger than you would otherwise wear. I mean, no tight, curve-hugging shirts. Ones that hang a little baggy will hide your curves. I had a similar problem with curves when I was pre-T, a freakin' curvy body.

Since I went on T, I seemed to have lost much of my curves, especially with the spare tire I now have! (I need to work on getting rid of it!)
Suits can be custom-fit to your body. Tell the tailor that you want it to fit like a man, and any one worth their salt will do just that. If not, keep looking. Also , get one that's a little large so it can be taken in properly.
These are what I can think of off the top of my head. Hope it helps!
Later, bro!

Ryuichi