I'm sitting here trying to think of ANY female characters I read when I was young that I really related to. I can't seem to think of any! I do like Anne and her stubbornness. I read a LOT when I was young, but I don't know if I ever related strongly to the characters. Madeleine L'Engle's books, Narnia, babysitter's club, etc...I loved them all but none of the characters stand out in my mind as being so similar to me.

Although now that I think about it...Kristy from Babysitter's Club might be closest! Description on wiki: Kristy is known for her great ideas (mainly, The Baby-sitters Club), as well as her bossiness and a big mouth that can occasionally get her into trouble. Something of a tomboy, Kristy is usually in her "uniform" of jeans and a t-shirt, sneakers, and sometimes a baseball cap, and she loves sports, even coaching a softball team for little children, known as Kristy's Krushers, which includes many of the club's sitting charges. Yeah, that's pretty much right! Er, except for the sports! Substitute reading and being a nerd for sports, and that's me.