I think this sentiment carries a horrendous arrogance:

"I don't think anything fundamentally matters, except that which we choose to care about."

Surely it should be:

"I don't think anything fundamentally matters, except that which we choose to care about. Though I know I'm only pretending and it doesn't really matter after all."

:P

(On a side note I've recently convinced myself that free will must be an illusion. Will post about that soon)