why do people cut?

Jo
(Please please please understand this is not in a  Rude or mean tone. I'm acting completely serious and just curious) I'm confused on why people cut themselves. I just feel like that would hurt a lot so why would you do it? Is it because the emotional pain is worst than the physical? Just confused on how people can bring themselves to do that, I wouldn't be able to (again I'm just curious and please don't comment if you don't have a serious answer for me. I've been wondering this for a long time but just haven't known how or who to ask)