Hating Your Part

Have you ever started working on a role and partway into rehearsals decided maybe you didn't like the role so much? What do you do about it?

I am in rehearsals playing Nellie in South Pacific, and I have to say I am not liking her much right now. Part of it is I am not totally believing that she would fall in love with Emile, which is making it hard for me to play it believably. The other thing is that I HATE my dialogue. It seems like every other character gets witty, interesting things to say and I'm finding Nellie dull to say the least.

I realize that it is my failings as an actor that are making me feel this way, but how do you get over it?