Why their were no women in the fellowship

[HerenIstarion]

and I'm not being sexist I'm a girl

Can it not work the other way round?

But, not to stray (or to stray just a little bit):

I consider myself a resonable merman. I set certain rules, and I expect those rules to be obeyed ~ King Triton to his daughter, The Little Mermaid.

The Midde-Earth [Free People] societies simply do not allow for such a thing. There are roles, yer honours, and there are certain rules. See also The Role of Women in The Lord of the Rings