Parents will always treat their children exactly as that: children. There's this alternation of being treated with love, and being treated as if you're this great burden. Then if you should so much as voice an opinion about the matter, how dare you be so ungrateful. The worst part is when you start believing them, and the thoughts of "maybe they're right..." come to you.
My sympathy. I've gone through it, and still go through it on occasion, though it's lessened a bit since I'm now living with family other than my mother.