Some people slit their wrists to try and relieve the pain, but if they fail realise it's more painfull than life. And they want to live.
"cutting" is usually
not about attempting suicide
most of the time, it's about feeling worthless, useless, powerless, faceless, invisible, sexually rejected, etc etc etc
when you're cutting yourself, it's not the same as a "pain addict" who gets their entire body covered in piercings/tattoos
when you're cutting yourself it's about re-aquiring
control, you yourself control the blade, you control exactly where to cut, how deep/shallow, how long/short the length of the inciscion, you're in control over which type of instrument to use
you're in control of how long the sewing needle stays inside your arm
by cutting the blood vessels or cutting between them, you control how much/little bloodflow there is
some people avoid the bleeding-to-death by "cutting the nerves instead of the blood vessels" for them, "cutting the nerves" is much more a stabbing/burning than cutting, it's much more painfull than ripping open the bloodvessels, and "the phisical pain makes the emotional pain go away"
in other people, they will actually come sort of close to bleeding out, even though they're not trying to die, for them, seeing the blood gush-like-a-gyser helps, the wet, sticky, tactile sensation of feeling the blood from your forearm slide across the palm of the hand is even more exhilirating than anything else that person will ever experience, a very intense almost spiritual experience,
but most of these people are NOT actually trying to die
they want to live, they just have fucked-up shit going on with their lives and the cutting is a coping mechanisim for mental trauma
like "foxhole religion"
even some of the "cutters" that actually die are not actually trying to kill themselves