What is the term for someone who hates themselves on the behalf of others?

Many forums have addressed this and none to my satisfaction. A narcissist loves their ideals, or something about themselves, just as a sociopath. Those who loathe their own existence do not always hate, more so they love others. It is our connection which pushes these poor souls away. A label may do no good, or exist, but it is truly an experience many endure.