This is a very serious issue for which you DO need professional support. What you have been doing so far has not been terribly successful, and you do need somebody who knows how to deal with such deep problems to help you. There is just no point in suffering the way you have been suffering. You are mentioning feeling worthless and self-hatred - all of those issues need to be handled. Abstaining from cutting is unproductive because you cut in response to your emotional issues, and without removing the emotional issues, you would relapse, so there is no point in hiding and you should seek therapy and, when interviewing prospective therapists, you should make sure to ask them about their expertise in your particular problems.

Good luck!