When you say "you," you are failing to properly account for the dynamics of human identity. I am not just a brain in a body. I am a fully engaged social being. The "me" that dies is not the whole me. I identify as part of a human culture.

And yes, if that human culture dies -- if humanity goes extinct -- then that is just about the worst thing I could imagine. You can scale that down any number of ways, but at no point will I agree that death isn't bad. I don't care if it's a single cell, a single organ, a whole person, or a whole room full of people. It's only as good as the value it produces for the whole, and my personal suffering is not a factor to that insofar as it doesn't disable my contribution.

And I didn't say death is the worst thing that can happen to you.