Did yall ever try the line of bras by
Olga? Those are the most comfortable ones in the world. (Of course, the line got discontinued.
But when I heard it was going to go, I stocked up.)
But in general, not every bra has to have underwire and all that. If you try on different brands, you can find some comfy ones. Warner's and Playtex bras are really comfortable.
I think the humidity where you live makes a big difference. Here in Colorado, you feel your bra less. When I lived in the humid Southeast US, bras could feel "sticky".
I'm small too. But when I run, go down stairs, or jump, it feels much better to be wearing one!