I am an 18 y/o male and since I was about 13 I've been pinching the skin in the center of my chest and on my neck. This has caused bruising that doesn't go away because I do it constantly and my chest has been calloused for the past few years because of it. I do it often without noticing and when I do try to stop myself, the feelings in my chest and neck are almost unbareable, like something is burning them. My family has always joked that I might be OCD because of other repetitive behaviours I do, but this one in particular is starting to effect my life as it is causing me pain and people think it's some form of self harm. I can't afford a therapist or psychiatrist and all I've ever been told by doctors on the subject is that they can refer me to one. Does anyone know what might be causing this?