I'm tall, mid 60s (but like a PP look a fair bit younger), always been top heavy (34G). The only time I don't feel 'chest conscious' - ie can unthinkingly wear a tshirt, and don't wobble in my extremely well fitted and pricey bra - is when I'm underweight. If I lose just a bit of weight, it goes from my tum, bum and thighs, making me look more out of proportion than actually slim.
What stories our boobs tell about our lives! I went from being completely flat-chested throughout secondary school and resigned to 'never having a boyfriend' 😏, to suddenly sprouting from the age of 16. 50 years later I still veer between being proud of my shape and all it's done for me, to wishing I'd had a reduction.
It's always influenced my style and choice of clothes. But I think in the end you just have to own it. Be a Scandi Architect (with boobs). Be an interesting artist or ethereal poet (with boobs). Be elegant, in the silhouette that suits you (for me, it's long flowing lines). Wear a pretty dress (with boobs - though finding those one or two you feel great in is the work of a lifetime! Excluding anything with a waistband knocks out 90% of what's on offer.)
Like others I despair too at the boxy, high-necked, high-waisted styles that have dominated for years for now. Perfectly calculated to turn me into a solid block, with skinny shins poking out from slightly-too-short midis and trousers. (Yeah, even when they're billed as long. From reviews, you realise a lot of shorter women buy the long length if there is one, for better fit and proportions.)
Still and all, it helps to see the bigger picture. For me, pilates helps keep me supple, slightly toned and reasonably happy with my appearance. If you're otherwise healthy, don't let your boobs get in the way of enjoying life!