There's no such thing as breasts that are too big. You're going to get what you're going to get, but if you are wondering if 36 DDD are larger than normal, than yes. Most girls at 13 haven't matured fully so they tend to be anywhere from a AA to a very small C cup. The band size of 36 is within the normal range though. At 13, you are still very young and should have decent back support to hold up a large chest, but many women with such a large size at such a young age end up with back problems. If severe enough they sometimes seek out breast reduction. My suggestion is because you are so young to talk to your parents or even your doctor about your feelings on the size to let them know what you think. It can't hurt.
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