If your dad would have been there when you needed him, he would no have scolded you because those scars are the result of silent calls for help.
Self-harm inflicting is a shout for help and those that love you (or at least are supposed to love you) should been the first ones to notice the signs that you are crying out for help and to respond to this signs.
Instead, your father blames you for doing what you did rather than to be understanding and asking you how HE could help making you feel better.
You have all my sympathy for what you had and still endure.