hey i properly started HRT pretty close to my 23rd birthday! it just takes time. i didn't look visibly different at all (aside from my increasing long hair) until maybe 5 or 6 months in, and the changes i've noticed since are still coming along very slowly. of course you don't pass after 3 months; you've barely even started! give it a year and you'll be surprised by how different stuff looks.
EDIT: if you do wanna chat, feel free to msg me on lemmy or matrix (see my bio) :3