The 22-year-old, who plays Arya Stark in the TV show, says she finds it impossible to turn a blind eye to negative social media comments, The Sun reports.
“I feel myself going down a rabbit hole, you’re almost craving something negative so you can sit in a hole of sadness,” she said.
“It got to me a lot because there’s just a constant feed in your back pocket of what people think of you.
“When people are on social media, they feel like whatever they write no-one’s gonna see it, no one’s gonna read it, but they do, and it will affect them for a really long time.
“I went through a huge period of my life where I’d tell myself every day that I hated myself. So many of these problems are really linked to things in your past — as soon as you start digging and start asking yourself bigger questions than: Why do I hate myself? It’s more: Why do you make yourself feel this way?”
Williams said she was “still definitely really struggling to let sadness wash over me without it consuming me”.
“There was a period of time that I was really sad, and then I sort of came out of that,” she said.
“It’s now really terrifying that you’re ever gonna slip back into it, and I think that’s something that I’m really working on.”
This article originally appeared on The Sun and was reproduced with permission