As a girl, when I started playing I assumed all girls were girls IRL. Over the years I’ve realized more guys than not prefer to play as female toons actually. It makes no difference to me personally. In my wow guild I would say there maybe 3 girls out of 20 of us but probably 75% of the toons are female. At the end of the day, it doesn’t affect any one but you so eff them if they care.

But you could always just ask your sister if she cares. Chances are she doesn’t :)