This will pass. You have had many times where you felt better and even felt hopeful. You can feel that way again.
Have you tried some of the options we talked about before? If not, you may want to do try them. They will help. It may taking you putting one foot in front of the other today, but as you go through the motions (the emotions do not have to be there yet and will come later), you will find it gets easier.
Try reaching out to someone. Call your boyfriend or talk to a friend. If there is someone to talk to at your church, try calling them. Sometimes having contact with someone else can make you feel less alone and provide to boost you need to feel better.
Also, consider trying an online support group,even if it's just for today. It provides someone to chat with who understands how you feel. And they are available 24 hours a day.
Write your feelings down. Don't hold back and let it all go.
Go out and do something. Get a coffee, see a movie, or just get some milk for home. Say hi to the check out worker. Make eye contact with others and smile. You may just get a few smiles or hellos in return. Just the contact alone will help.
Distract yourself from the cutting. When you feel like cutting, tell yourself that cutting is not your only option. You have other choices. List them so you know your options. You also have people that care.
Identify the feeling that is driving you to cut yourself. Are you feeling depressed, angry or lonely? How can you address these feelings in another way that is more healthy?
Eat a piece of dark chocolate. It has natural mood boosting chemicals that may help take the edge off your feelings.
Try these things and see if they help. Let me know how you are feeling.