My (20F) husband (23M) wants me to talk differently, how do I do that?

My husband and I grew up so differently and it really shows when I’m around his family. They grew up in a rural, bible belt, conservative area and I was brought up very differently in a politically and ethnically diverse, liberal, city area. I’m very opinionated and I say things like “oh my god” and stuff without realizing. I’ve cut out any cursing around them and don’t talk about politics or religion about them but now he’s saying I’m causing problems by saying stuff like “oh my god” and I didn’t realize and I wanna get better about it. I just don’t know how to do that. Do you guys have any tips on retraining the way you speak?