Being a college student/small part-time model with dreams, confidence in my charm/abilities, a large social circle, and endless female validation for my looks (was once unfortunately addicted to it) I have never had trouble getting any the girls that I've wanted.

Before you ask "If you have no trouble with women, why are you here" my answer is that I am aware of huge buff from my looks, and it makes me feel like a fucking pussy having to rely on this halo all this time and never give an effort trying to improve other parts of myself. I want to be the best version of myself. It doesn't feel good banging a chick knowing that know the moment I put a bag over my face and sees one slip of beta behavior, she'll bounce.

One of the girls I've pulled is a Japanese married woman (no children) who was a class volunteer last semester, and while her husband is at work, we've been getting it on ever since.

Here's the problem. I am very sure that she's only with me for my looks - I can speak Japanese but not fluently yet, and that has led to me pulling some extremely beta moves because I can't fucking say what I want. I'll try escalating in Japanese and it'll either end up with me stuttering or saying
"never mind." There are so many times where I'm not in charge of the conversation and I end up in her frame because I can't detect everything she's saying. I'll fail her shit tests because I can't reply with a passing response in time.. you get the point.

Is there anything I can do to regain control of the relationship despite the language barrier? Learning Japanese is one of my hobbies and mastering it is one of my dreams, but I won't be Japanese salaryman level by tomorrow. Sure, I get pussy, but I suspect she's losing attraction for me since anything we do outside the bedroom is so inherently cringy and beta. Since this is JP culture we're talking about, is being beta here actually okay? Thoughts would be appreciated.