I'm Done - I'm Done is when you're so done with something you're like,

I'm Done is when you're so done with something you're like, 'I'm gonna leave and never come back, and I mean it.'

I'm Done with this game. I'm going to live in a cave.

I'm Done. I'm going to eat my feelings and my problems.

I'm Done. I'm going to vanish and never return.