People think we're wrong together. End our friendship?

Other people think it's wrong that I'm a guy and my best friend is a girl. They insinuate because we don't date or bone automatically makes me gay! WTF I like girls but I don't see my friend like that & I totally act like a dude. We're considering going our separate ways but it's not easy. We've been friends for years and understand eachother well, true friends. & she's awesome. What can we do? Is it wrong we're friends?