"My New Year's Resolution is to stand up for myself," Jennifer says in the January issue of Marie Claire South Africa.
"It's hard for me. Nobody wants to be disliked. You always want to be polite and be nice. I tried to find a balance in saying what I mean and still being nice. I can't do it. I have this 'okay' attitude and everything. I end up allowing myself to get walked over and resenting it."
But one thing she has no problem resisting is Hollywood pressure to be stick-thin, saying, "I'd rather look chubby on screen and like a person in real life."
The Oscar-nominated actress also explains why she prefers to spend nights home instead of out late partying.
"I don't like going out that much," Jennifer explained, "I'm kind of an old lady. After it's 11, I'm like 'Don't these kids ever get tired?' When I'm out, I think about my couch."
On January 19, Jennifer will stay up past her bedtime to host Saturday Night Live and we can't wait to watch her!