Idk what to do. I don't feel sexy

So I'm like 15 and I have had sex with my boyfriend recently and he tells me my breath are a perfect size but I have always been so insincere about them. I'm like a 32C or like a 36C and I think my boobs are really small and I feel the same way about my butt. And idrk if they will get bigger. My half sisters are all busty girls and I'm afraid I won't get that. Would it be a good idea to try natural ways to make them bigger or should I wait since I'm only 15?