Struggling With My Secret Fantasy

I’ve been struggling a lot lately because of this fantasy I have. It’s not something my partner and I share, and it makes me feel really alone sometimes. This particular kink involves a role that feels very much out of character for who I am. Lately, when we’re intimate, I find myself longing to step into this other persona, even though I know deep down she doesn’t want me to. It’s like there’s this part of me that’s craving something different but I’m too scared to ask or suggest anything. Is it normal to feel so torn and conflicted? Am I the only one who feels this way?