I like the pain of biting my mouth

Since I was a child, I’ve always had a habit of biting my cheeks, lips, and tongue. I’ll bite the shit out of it until it’s bleeding really bad and keep doing it. Something about it physically feels good and is satisfying. Obviously tho, it’s miserable when a week or 2 after my mouth is in constant pain and I can barely speak or brush my teeth without it hurting like hell. Is this normal ? Comments appreciated as to why a person does this