Lawrence said she approached a male producer about the line-up.
"He said he didn't know why everyone thought I was so fat, he thought I was 'perfectly f***able'.
"I let myself be treated a certain way because I felt I had to for my career."
Lawrence was speaking after the multitude of sexual harrassment and assault claims levelled at disgraced movie boss Harvey Weinstein.
But the Passengers actress believes "every human" should be treated with the "respect" they deserve and shouldn't be forced to do things to please other people.
She explained: "I'm still learning that I don't have to smile when a man makes me uncomfortable. Every human being should have the power to be treated with respect because they're human."
And Lawrence has admitted she now has an "understanding" of the entertainment industry, but she used to find her celebrity status "overwhelming".
Speaking previously, the Hunger Games star said: "Now I have an understanding, I have a patience with it. Also I get time off from it, I think at first it was really overwhelming and I was like 'Is this what it will be like for the rest of my life?'.
"But when I am releasing [a movie] it is really heavy and really intense, and I know it will die down and people will stop caring pretty quickly."
And Lawrence has admitted she will always be honest and open up about her feelings because she is not fazed by the consequences or backlash she may receive from the comments she makes.
She said: "I don't really have a choice, which can be scary sometimes. Because if it was something I was doing on purpose then when I get bit by it I can be like 'Oh I'm not going to do that anymore'. But I don't really have the ability to be different. So when it bites me in the ass it bites me in the ass.
"When I do say something and I want to put my foot in my mouth I move on. Otherwise I'd be in a foam room."