I've had a hard time writing girls in the past, and now I'm thinking it's because I've had a hard time finding female characters in other stories who I could tolerate. I feel like because I am a woman, I should be able to write women characters...but honestly, there are just so many aspects of girls' attitudes and behavior in real life that I just dislike, so I stick to writing about boys. If I ever wrote a female character into any of my stories, I would just be self conscious the entire time, worrying that the character is coming off as annoying or unrealistic as the other female characters I've read in the past. The only types of female characters I've been able to enjoy reading in the past, have just been...normally male characters miraculously turned into females for the sake of the story?
As in "girl!Frank" or "girl!Gerard". I never really had an issue writing boys, because I do have a brother, and I don't particularly feel like the male mind is that hard to write realistically.