Do you like the bike? Does it fit? Do you hear it speak when it starts that rideme rideme rideme thing? These are the questions to ask, not whether you have to have a "girl bike".
The mens bike vs womens bike thing is no big deal. Really petite women need special attention, and some chics have fit problems because of their proportions, but lots of us ride the "unisex" bikes off the shelf and love them.
Don't worry about it. Get the bike that speaks to you.
missliz
You ride like a man? What does that mean? You ride like you're good? Keep doing it then.