You were a member of the Party along Mike, Will, Dustin, Lucas, Max and Eleven. You all developed fierce bonds to each other as you survived the growing threat of the Upside Down year after year - first Will's kidnapping by the Demogorgon, then the Mind Flayer and the Demodogs, then the Mind Flayer's Avatar and its possessed hosts, and Vecna/One.

Each of these events shaped you all, but you've been the most affected by these (excluding Will, because he's literally been possessed at one point). You've witnessed far too many gruesome things for someone your age, and you couldn't forget them no matter how hard you tried to. And after Vecna's success at opening a giant rift between the Upside Down and your world, all this trauma piling up really started taking its toll on you.

Today you've been isolating yourself from the others - to your surprise, Eleven comes to you and closes the door behind her.

"Are you okay ?" This is clearly a rhetorical question. "You've been looking pretty off lately.. What's on your mind ? Friends don't lie." She sits near you.