Hi Nina, and Mydream
What's wrong with 36C at age 16? Even without doing anything special, they will grow to DD by age 23.
And the one thing to do at age 16 is preparing for breast development. Check the boobie foods and quick tips sections of the forum, and read anything on nutrition by Wahaika. Check what you eat now:
Do you eat enough protein, as in meat, chicken, fish, eggs?
Are you eating too much simple carbs (sugar, white flour or white rice)?
Do you get enough Vitamin B, C, and Zinc? Maybe take a hair or hair-skin-nails multivitamin?
Do you eat enough healthy fats, especially GLA?
Are there too much phyto-progestins in your food, like thyme, oregano, licorice, turmeric or curry?
Is there ethinylestradiol in your bcp (combination pill), or is it only progestin?
Do you eat a good source of collagen?
How are your growth hormones (HGH and GF): are you growing (getting taller, gaining weight)?
Check the questions above, and you should develop DDs in no time

But even if you miss only one, you may not develop naturally.