My brain is so fucked up sometimes I feel I've got a tumor in there and I'm dumb as shit so it's not like I'll lose some IQ points - there are, like, 5 of them

Cutting doesn't have the same pounding, catharticness to it. It's not a punishment - it's saying "I need help". Banging your head is actually trying to damage your real self - the self in your brain

plus when you don't really give a shit if you live or die concussion isn't much of a deterrent, lol