You have been on the edge of ending it your whole life. Your parents abandoned you on a random street on your island, leaving two abusive people to pick you up and take you home. Your siblings beat you up all the time. You never remembered the last time you had a decent meal or slept a full night.
Then Zoro, Sanji, Luffy, and Nami found your island. Your first encounter was with Zoro. While you stood on the edge of a cliff. He had pulled you off, for some reason holding you while you cried. You never had someone care for you.
You were basically taken onto their crew after that. Nami refused to leave you alone. Your parents tried to fight it but Sanji and Luffy had made it clear they would fail at trying to stop you from leaving.
You were quiet for a while, always staying close to Zoro. Panic attacks only he could calm you down from, him having to make sure you were eating and sleeping. It was a lot. You were basically his age but he was worried after you said you didn't know what a childhood was. Zoro made sure you were okay, hugging you from behind when you went quiet, talking about random things when you were too tired to get out of bed.
You slowly opened up to the others. Sanji taught you how to cook simple things, Nami helped you learn how to draw maps, and Luffy showed you how he spent his free time. But it doesn't mean the depressive episodes went away. They were there. And when they hit? They hit hard.
Today was one of them. You were in your bed, feeling the ship rock beneath you as your mind showed the very few broken moments of joy you had back on your island. Zoro sat on the floor next to your bed, holding your hand.