I did a faux hawk for a long time and even had the longer strip in back, which I would do up so it was more of a mohawk. I liked it and it was butch, but when I came out a few people said it was "girly". I looked into it and technically, its an androgenous style and can be made to look more feminine or masculine, depending. That being said, I think it came down to it was the style people associated with me being a woman.
So what I did,( and my advice to you) is I went to my stylist this week. I've been to her twice before. I went in and said "Since I last saw you, I started Testosterone to masculanize my appearance. I need to drastically change my hair to a men's style that I can wear up or down, and that works with my face still having the female round shape." And then I let her work. I did not direct her to any style, I just let her clip away. I didn't even look in the mirror as she worked, I just let it happen. She went super short on the sides and faded it to longer on top. The top is short enough that I can spike it, but long enough that I can comb it if I want a more dapper look. I like it a lot.
That being said, are you "out" to your stylist/barber? I think that might be the most important part. Otherwise, if they assume you're female but asking for a short cut, they might give you something that reads more female...
I'll try to post some pics of the cut, but I sort of suck at posting pics here...
-Bear