Bottom line it's all a matter of your mindset.
Is the act degrading and therefore humiliating to you?
Do you abhor that or relish it? Why?
Is it the circumstances or the person who's imposing the act on you?
Is there a difference between humiliation and 'merely' being embarrassed?
And lastly, Is humiliation merely the emotional equivilent of pain? Something you would normally avoid... but in the context of bdsm-play, glorious.