I can’t tell if your question is intended to be sarcastic or not, but just in case the majority of trans persons, including a large majority of trans women, never get surgery. A larger portion of trans men get surgery (mastectomies) because it’s a lot harder to pass if you have prominent breasts. Trans men with smaller breasts, including younger people, will often use a binder, which compresses the breasts so that they’re much less noticeable.

There are a number of reasons trans persons don’t get surgery. Some simply do not want it, and that’s okay. We don’t get to be gatekeepers on this issue. Being trans can be entirely about presentation. Some would ideally have it, but they’ve set up a lot of hoops for people to jump through. There can be a long series of consultations and exams that are required to determine if a person is going to be considered a candidate for surgery. It can be expensive, and isn’t always covered by insurance. As with all surgeries, there’s always a risk of complications and variability in outcomes.

Again, I hope you were being sarcastic, but if not (or for others), I hope that answers some questions.