My darling Mandy used to self-harm and though it's difficult to cope with, it's not impossible to get out of it. Snap a rubber band on your wrist. This isn't the best technique but it's better than SH.
Suggestions: Write down any negative feelings and then rip the paper up. Pet or cuddle with a dog or cat. Wrap yourself in a warm blanket. Massage your neck, hands, and feet. Listen to calming music. Distract yourself holding an ice cube in the crook of your arm or leg. Chew something with a very strong taste, like chili peppers, peppermint, or a grapefruit peel.
Talk to someone. If you don't have a professional to talk to, call a friend on the phone or meet them in person. Tell them what you want to do and why and I realise that SH is a private thing, but it's worth reaching out to a friend and asking them to be with you. Or just have them distract you from the self-harm.
Mind Infoline – Information on self-harm and a helpline to call in the
UK at 0300 123 3393 or text 86463. (Mind)
Another tip here is if you're too nervous to talk in person, consider starting off the conversation with an email, text, or letter (although it's important to eventually follow-up with a face-to-face conversation). Don't feel pressured into sharing things you're not ready to talk about. You don't have to show the person your injuries or answer any questions you don't feel comfortable answering.