How do I get out of the bro-zone?

A friend of mine just bro-zoned me. I'm not interested in him romantically, but his line ("No offense, but I don't think of you as a girl. I think of you as a girl bro") just made me think about what kind of image I'm giving off. What can I do to get out of the bro-zone? I just don't want to be labeled automatically as a "bro" by guys I meet, especially those I'm interested in.

I'm kind of a tomboy, in that I prefer playing video games than worrying about makeup and stuff.

Just a few facts: I'm 25 and I've never had a boyfriend. I know I'm not ugly (I've been called cute/pretty/beautiful by strangers and acquaintances) and I think I'm nice. I have a casual attitude, I smile a lot, although I am pretty shy. A guy friend of mine said I can get pretty intimidating especially since I'm smart and my family's a bit well-off. I don't know if these play a factor, but I just thought I'd mention these.
How do I get out of the bro-zone?
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