How can you deal with being born in the wrong body if surgery is not an option?

I'm biologically a male, but ever since I was young I've known that I was a girl just in the wrong body. It doesn't usually bother me but some days I just hate waking up and seeing a boy in the mirror, it interferes with my whole life because I'm not comfortable being in a male body, it doesn't feel natural. I mean who can you even talk to about that, I can't just say "Mom, I'm a girl" it just doesn't work that way...