Whyyyy do dresses do this

Going to a friends black tie optional wedding soon. Rented this dress that fits well and I feel beautiful and sexy…except I wish it was like 60% less boob. But this keyhole….I ordered some tape to try but I’m scared of it.

My bf says I should just rock it but he doesn’t understand the stress of growing up with people always talking about your breasts :( it’s hard to try on something and feel like if your chest was different it would be better! Just need to vent to some people who get it.