>To be fair, all of the best decisions I've ever made have come out of "I feel that way" and all of my worst decisions have come out of "This is rationally correct".

You could hypothesize things are likely to be that way because there is no rational purpose to life - you do some stuff then die. If anything you could say a successful life is one where you enjoyed the ride which may be maximised by doing what feels right. I guess.