A 36 band, meaning your underbust is close to 36 inches is a larger ribcage, but doesn't necessarily mean you are 'fat'. You may just be broader around the rib area. That said, if you meant you are 36 inches around your actual bust area, then you shouldn't be a 36 band and may want to consider getting professionally fitted. It might turn out you should be a 32D rather than a 36B, which is technically the same cup volume as a 36B but on a smaller back size. Hope this helps.
No, it means you have a bigger ribcage and your breasts will likely have more volume than a 34b girl.
5/6 jeans isn't that bad. It's normal size; average.
You should actually measure your bra size yourself because if you are a size 5/6 in jeans you could very well be a smaller band size/bigger cup size. Most fitters and other calculators measure wrong (add 4 inches or something). The best calculator is this one:
...you understand you're not even in plus-size right why do girls think they're fat when they don't even plus-size ranges.
no, that seems normal. def not fat! girl love your body :)
