Being a busty teenage girl, help please

I’m 16 got D cup/DD cup boobs and if your a busty girl you know it can suck sometimes and for me all the time

I’m always really self conscious about them I feel like there to big for my body and usually wear 1-2 sports bras to smush them down but sense it’s summer its hot, so layers are my enemy and whenever I wear sundresses(it’s extremely rare you will know why in a second) I feel uncomfortable because on the model she had like a b cup and it looks super cute and dainty and when I put them on my boobs are just falling out of the dress even tho it’s the right size. It makes me feel more slutty then dainty.

So if you could just try and cheer me up or give me any good reason why having big boobs is a good thing

And please please do not comment “well at least you have boobs” it does not make me feel any better