You are responsible for your own life and not another's this is not a choice but a requirement of life it's self. I am not saying you should not care about other people and become arrogant and pretentious.
You come first in all circumstances contrary to what people may like you to think, the ones you live are second and then everybody else. I am also not saying not save some baby from a fire to save yourself.
You are to look after yourself with the utmost importance then you can continue with sharing your love with others, this requires a lot less stress o one's mind and body.