You are who you are at the moment, have the problems you have; I think your fiancee is not going with the flow :-) and just letting you be yourself; you can write whatever stories you want, feel how you feel, be sane/crazy and it has nothing to do with her, other than she can choose to "be" with you, alongside you. I would be annoyed at her and her anger, tell her to leave you and your problems alone and concentrate on her own?

I would make it clear you have trouble sharing yourself with her, because the way she reacts makes you uncomfortable and feels intrusive. She's boundary crossing.