Actually, hormones mediate most of the things we think of as male or female appearance. Facial and body hair stops entirely, or otherwise gets markedly thinner to what's normal for females in your family when on DHT blocking antiandrogens. Bone structure is what it is, but face and body shape are significantly changed by muscle mass and fat deposits, which change based on hormones. Male and Female voices have an octave or more of vocal overlap, and with training anyone can learn to speak and even sing in a range suitable for their identity. That aside, there's also surgical options for all of the above, if that's your preference or if you have the money.
On the near future side: in the lab, researchers have even begun to enable organ transdifferentiation and fertility in Post-Puberty mice using the body's natural Sex-Deciding and Maintaining mechanisms; the same ones that enable some species to change sex in adulthood exist in Mammals, but are just not being used by the body. Mammals experience more physical differences between the sexes which might not change, but research suggests they'd be able to produce their own hormones, develop secondary traits, and potentially have kids as their identifying sex with a bit of medical assistance.
As a side note, contrary to what society tells people by things like the word "pass", trans people don't need to make others believe they are a cisgendered person as part of being Trans. Some transmen don't have deep voices, beards, or masculine shoulders; some transwomen have bushy eyebrows, low voices, stubble, and big hands. These exact same things happen in Cisgendered people too. Bodies don't have gender, and not fitting an arbitrary beauty-standard, or having a body that's different than other people of your gender doesn't make you less valid in your identity, or any less of a Man, Woman, or Person.
Edit: Wierd, relying on falsetto is generally considered bad advice for a transperson trying to pass as Cis; it lacks overtones, and sounds tin-ish and thin, and like a person doing a silly or cartoon voice. Better to practice intonation, and use your upper comfortable range; men and women have overlap in half or more of their range. The tricky thing to learn is intonation, "resonance" or timbre, and manner of speaking.