Breast growth develops mostly throughout the first 2-3 years of Estrogen HRT so you still have time to grow, I'd hold off on implants until then. Also because the more time you give your boob skin to stretch, the better your implants will look if you end up deciding to go for them. Patience

How boobs look on someone is not related to their height but to the width of their ribcage. You may have C boobs but if you also have a wide barrel ribcage, they won't stand out so much. On the other hand you can have small Bs which will look very nice if you have a small or moderate size ribcage. YMMV.