derealization is kind of like living in a glass bowl. Everything is happening around you and none of it really seems real or relevant to you. Everything is distant, seems like it doesn't apply to you, like it isn't happening. Like you aren't relevant to or part of anything happening around you. Everything is muted and there's a massive disconnect happening. Nothing about the world around you seems real or vivid. Perhaps your life is someone else's, or a dream.

depersonalization is an out-of-body experience; like you're floating separate from yourself. It's like you're watching yourself do everything. Like you're separate from your body and it's not yours it's not you, you're someone else, an observer, watching someone else go about their day. You lose your sense of self, so to speak. Like none of your actions or thoughts belong to you, they're the actions and thoughts of someone else who looks like you who you're observing.

At least, that's how both of those are for me!