I felt the same way as you, brother!! So you are not
alone!!
The disco/pub will be loud, so no use "telling" her about it, like
you say, they will feel offended or get the wrong idea.
You can shift places with you friends loh, maybe one of them like
fat gals... ha ha!!
Anyway, dun have this "fat gal's boobs rub against me" experience
b4, and dun intend to have it(mostly just slim, chio, model type
gal rub against me, well, I got use to it, nothing much). Just
watch you step in there and try not to bump too hard into anyone if
its too crowded.
Cheerz brother!! Itz Tiger Time!! Dun drink and Drive!!