You are so lovely and wonderful. Your body is beautiful and you look so at home on this beach. I wish I could tell you that those words you hear every day on the bus, on the playground, at lunch won't matter and they don't mean anything. They do. Those words will stay in your mind forever. It doesn't make you weak or horrible, it makes you human. Just don't dwell in that sad place, stay bright.
Just know that one day, ten to twenty years from now, you will realize that those kids were just mean. They may one day grow up to be really incredible people and regret those words, but most of them won't even remember they hurt you so deeply. Forgive them, move on and don't believe their lies even though it's so easy to do.
Your boobs will one day be an asset. You will always be curvy, you should love that. You will marry an incredible man who makes you feel beautiful at any and every size not because of your outward beauty but for your heart, your passion and your kindness.
Don't be mad at your dad for taking this photo, you will thank him for it one day because he saw you for who you really were not how you feel in this moment. You are beautiful and beachy and awesome.