Read it this way

Too much moping. Focus on the positive.
Home is nowhere. Actually, it's everywhere.
I can't even hold on to my memories. That's why you are endowed with the faculty of memory. What's the use of memory that's not warm and living, anyway?
Life is mediocrity. Only if you insist. Give it your best shot, and who cares about the rest?
But what if I screw up? If you screw up, you smile bemusedly, shrug it off, and figure out how to fix things.
Does that work? Who cares?