[avemuri]

It sounds like you feel your dream is unachievable, not that it's the wrong dream. I'd at least spend some more time exploring how else you can achieve it. Transfer to a different school without switching fields? Do the 5 year program in six years? Do a different program that still leads to a career in machine learning? Just take a break and go back to school in a few months?

Just throwing some thoughts out, but it sounds like you're burned out because you've lost touch with what made you passionate about this in the first place and it seems a pity to abandon it without exploring other paths to the same goal.