Nero, this takes time. Please be patient. This is a gradual process, and I have seen plenty of guys go through it, but it can take over a year. Its gradual, it doesn't happen overnight.
Early on with HRT, there is a thing for all trans folks a desire for things to happen now. But the truth is ones body determines its own pace, and it requires patience. Don't worry about what you see now, think what you will see a year, two years from now. You will start to look more like an adult as time passes, don't stress too much. This is a long term process, remember most natal men take 5-7 years to go through puberty. It will probably take two to three years for you to start looking your age. Be patient, its my best advice.