Just try to hang in there. Do something distracting. Call someone on the phone. Draw. Watch TV. Write in a journal. Use an ice cube. Take a shower.

Go to http://www.selfinjury.org/docs/selfhelp.html . Scroll down a little and it has lists of things to do instead categorized by what you are feeling.

And you are important, not junk
(((((((((((hugs))))))))))))