How are y'all wearing so many non-bra-compatible dresses and tops

I'm 33 years old and 34b. But it's been true ever since my teens, that my chest looks exponentially better when wearing a bra than without. Like my boobs move up about 4 inches wearing a bra vs not. To the extent that I really don't feel comfortable stepping outside not wearing a bra. I feel confident and comfortable when my body looks good. Which is the case only when wearing a bra.

Yet. 90% of dresses out there are not bra-compatible. They're either spaghetti straps, backless, strapless, off-shoulder, plunge or whatever.

Yeah, stick on and strapless bras exist but they don't do anything to keep the girls UP.

Does everyone else just have perfect perky boobs and doesn't need a bra to keep the girls up? Are you wearing like a corset type thing that somehow gives you the lift without having straps? I see women out there even with pretty full figures wearing such non bra compatible dresses and usually still looking good.

Do your boobs seriously just stay up under their own power? That seems physically impossible except for members of the IBTC who are under 25 and never lost weight. I've lost and gained weight over the years but never bigger than a C cup. Does my body just suck?