A couple of thoughts - your mother may think that by never accepting this fact, she keeps up pressure on you to change, therefore you will change. Whereas if she accepted it, you would have no reason to change. This presumes of course that it is possible to change. She knows it is not possible to change, but it is possible to make other choices, IgnorIng your feelIngs and true beIng, and she wants you to make choices she approves of. My mother spoke of a lesbian relative "choosing" not to have a husband and children. She didn't talk about much, so I have to think this was something she understood personally.

2nd, keep looking, the right job is out there somewhere. I am so hopeful and proud of you.