Humiliation in BDSM - How Much is too Much?

Humiliation. When it comes to fetish and submission, humiliation is a given. But is it okay? At what point does humiliation start to cross the line to bullying and become detrimental to your mental health? Why is humilation part of submission?Why do I like to be humiliated at all?When does humiliation become hate?Can humiliation actually help your self-esteem?How can I play but still maintain my self-esteem?How to humiliate without damaging your sub What are your thoughts on humiliation?