I would take care of facial hair, wax my legs/arms, ask for a unisex hairstyle cut and learn to wear it male style/ female style, practice on voice with speech therapist, learn to do makeup. Etc
Yet, you must realize that at 19 you're still growing and the longer you're exposed to testosterone, the harder it will be to change presentation in the future.
Maybe you should get a psychologist and try to figure out for yourself if you're truly genderfluid, or maybe just scared to transition? The sooner you figure it out, the shorter will be your transition. It is not fun to realize 'I cannot be in the wrong body anymore' at 40 when you're married and have children.
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