I’m scared T^T

I’ve been very depressed nowadays and self harmed 24/7. I opened up to a teacher at school today and realized I shouldn’t have, she threatened she’d call the cops or immediately tell my parents and agreed that locking me up is a good choice… How is this okay??? I hate where I live in I’m so fed up with life that I think I’m going to kill myself earlier than I’ve planned. After what I was told I felt so angered so I took the blade again and cut my front thighs, when I took a second look I was terrified to see the blood dripping down to my knees… I ran several times around the school picking cloths to keep my wounds shut, now I’m going to get bandages and never remove them until my wounds fade into scars :( I’m scared that I’ll die from the amount of blood I lost, I almost lost my life today and maybe I’d be put me in a hospital and kept forever on purpose not to let me end my life. I’m trying to recover from the anxiety I had