From ur post i assume ur still living at home?
my advice is to grow up fast, i know it may be hard, but before you take a stance(especially to ur mother) it wont stop(i hated it too).
It's because of lack of respect, and it wont change before you grow a spine, and when u do, depending on how the relationship is, it could hurt ur relationship, or not.
but still, it's not them helping you, or them trying to be generous, its that they have no respect or confidence in you, so ofc you get angry about it, ur not stupid, you get the underlying vibe.
I'm sorry if it seems cold or anything, i'm just very bitter over my family, but ur not alone 