Most urges can’t be avoided forever, it is best to learn how to cope with them.
This is a site I use quite often to help me:
http://www.siriusproject.org/alternatives.htm
The best thing to do is get help. A therapist can help you learn how to cope with the urges and help you work out the underlying causes of the urges to cut.
If you ever need to talk I’m always around.
Best of luck and stay safe!