ok it sounds like you are dealing with some tough situations at home. And the self harm may your way of coping with it and other stressors in your life. Can you find a teacher, a doctor, a school counsellor, a family friend, a aunty, uncle or someone to really talk to about whats happening? You will need to be honest and it needs to be someone who is trust worthy and who will take action to help you. You are normal, but self harm is not a safe coping mechinism. I dont belive its ''attention seeking'' it can be many things, none of them straightford or simple.
You need to reach out for some help, will you do that?