Outright Villainy said:
My personality is really impermanent...
We all change. We're often different people even just when other people are around. I've sometimes worried that there's no core 'me' just various aspects of self that I present to people, but even if that was true (and I don't think it is, I think there's a central me) it wouldn't be too much of a problem. you're your experiences, memories, emotions, all adjusted by how you feel at the time, and altered further by your present circumstances. From all that, something that is cohesively you and stretches back for years still exists. It's quite amazing, when you think about it. Even though you don't have a single brain cell you had 10 years ago, you're still you.