How do you have sex while still trying to maintain a "masculine" feeling

Hey, first time posting here so sorry if I say something wrong. So I'm ftm pre-t and have a long-term cis girlfriend of about two years, and have been getting "intimate" for about a year, but at the same time not really? Like is really just dry humping with full clothes on. Thing is, I know that at some point me and her are going to want to do more than just that, but I don't really know how to feel comfortable while doing it. It's not that I feel that she's going to feel grossed out or anything, she's great and I have no fear of her reaction, it's more so just myself and my dysphoria that cause the conflict. Any advice on how to have sex without letting the dysphoria take over?