Can't kiss good

Ok this is embarrassing but I'm getting desperate lol. I'm an 18yr old mother of one. I am with my babies father & we plan to get married. We have a great sex life & we are both pretty experienced almost all the way around. There's one thing I can't seem to figure out how to do good & my SO does it great but I don't know what to do lol French kissing. I get so awkward & I just don't know how to move my tongue or anything and I don't know how to improve & I don't want to ask my so to teach me because I'll get mad ( long story) so what do I do lol. I need tips I can try without directly asking him to teach me.