It's also selfish, narcissistic and kind of anti-social. Somehow, we've uplifted "taking care of yourself" over every other societal norm, obligation, and courtesy. Humans are not meant to be "on the comfortable/happy path" 100% of the time. Sometimes, we are expected to act altruistically. Sometimes we should make small sacrifices for others' benefits. Sometimes we should be go out of our comfort zone to comfort someone else. This doesn't mean torture yourself and ruin your mental health, but it does mean stepping out of your usual routine occasionally, for other people's sake.