Advice, help please

Kilee

I'm currently 14 and weight about 185-190 pounds. I need to lose weight really bad for a couple of reasons.. my boobs are a size 38DD in other words 36DDDD, they are too big to function with. My waist has gotten bigger aswell which makes me feel uncomfortable since my family encourages me to be healthier more and more. I really want to shed atleast 20 pounds, any tips tricks, exercises that I can do?