What qualities/attributes in a woman can make them seem "masculine"?

I've been told by many people I'm masculine for a woman, which I don't necessarily think is a bad thing.

A few of my close friends/family say I'm a mix of masculinity and feminity. My best friend is very feminine and we are total opposites in that aspect. My boyfriend says that he likes that I have these qualities because it seems like a good balance. Though I have a hard time understanding what makes me appear that way.

What qualities do you think of that can make a woman appear masculine? I know there is a gender binary so I guess I'm trying to understand others thoughts on it and how they perceive things.
What qualities/attributes in a woman can make them seem "masculine"?
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