For the first time in almost seven years, a doctor just said I'm most definitely still growing. O, frabjous day!
They make shoes with lifts in them if you're really uncomfortable about your height. If you plan to go on HRT, other masculine features like a beard, deep voice, and body shape changes will help, but YMMV. Also mannerisms help a lot- if you feel male in your mind, and you're secure in that, people are a lot less likely to question you and will probably feel stupid for asking if you maintain that mindset.