i'm sorry to hear that you're going through a rough time. D:
like kazine said, psych wards are usually meant to treat those who are dangerous to themselves or others. if you feel that you are very suicidal or are cutting yourself very badly, it might be a good idea. if not, i would think that therapy or medication would help you more. maybe you could try calling a suicide hotline or talking with someone you trust too?
i don't know much of anything about self-injury, but if you want to break the habit, why not try to do something other than cutting to make yourself feel better? play loud music, go for a walk, talk to someone else about how you feel, etc. maybe you could go and be around other people whenever you feel like cutting until it goes away. maybe?
also, maybe the borderline personality or depression forums would have been a better place to put this. i see that you're new here... i could be wrong, but you don't sound much like you have schizoid personality disorder. schizoids are loners, either barely have or barely show their emotions, can't stand much social interaction and don't have many friends, and are indifferent. you do sound like you may be borderline or paranoid, though.
of course, we're happy to try to help you here, but you might benefit more from people who might be going through what you're going through. you can look up a description of the disorder at the top of the forum and see if it sounds like you. and if you're going to therapy, a doctor would be the best one to diagnose you. we have the opposite problem that you do, we don't care about much of anything! XD
bpd forum: http://www.psychforums.com/borderline-personality/
depression forum: http://www.psychforums.com/depression/
hope that helps, and good luck! <3