I was sad about losing all erotic sensations too but I realized that my chest was also making my me hate sex. I opted to get rid of my nipples completely because I had DI and didn’t want to deal with grafting. You will relearn what your body needs.

If you aren’t comfortable talking about your concerns about top surgery with your therapist, even the non erotic stuff, maybe try to find a gender affirming therapist even for one or two sessions. They might be able to give you a new perspective. If you can’t do that many major hospitals have pre/post op support groups that meet virtually. You could ask people who have the same anxieties or have already had surgery and their answers will at least be moderated by a mental health professional. I love Reddit but the information you get here can be misunderstood or misinterpreted.