I used to self-harm on my arms and the scars are still there. They've turned white but aren't raised or indented at all. It's been a few months since it happened and I'm getting really worried about them. How long will they take to disappear? Can I speed up the process? I'm NEVER going to do it again; I just want another chance to make things right. I'm ashamed of what I did and everyday I'm reminded of it.
Study some books about nutrition so you know a few things. A deficiency of B vitamins can cause a desire to harm yourself or even commit suicide. Vitamin B2 is a dye that makes urine bright yellow, so when the color fades, you need a supplement. Scar tissue forms when the body can't get enough oxygen to the tissues, and that is what vitamin E does. Get "Pure Vitamin E Skin Beauty Oil" at the cosmetics counter, or capsules in the vitamin aisle. You can poke a hole in a capsule with a pin and squeeze the oil out. The oil has to soak in, so put it on when you can leave the skin bare for a while.
Learn the business:
cronometer.com/ (I haven't tried the software.)
charlesatlas.com/ An exercise plan that has been successful for over 80 years and requires no equipment
I hope you are alright now. I believe you should not just stop harming your self but also make a challenge for yourself; #selfharm free! where you see yourself going for more than 100 days without going through this. For the scars, I don't have anything to share since I have not had dealt with any, but try not to feel ashamed of these scars. It won't change anything. You have to be confident and by overcoming this self-harm thing that many people are struggling with, you will learn self-acceptance and not hide because you have visible scars.
Were you able to find shelter, at your teacher's or otherwise?
They might remain. Some factors are width, whether the wound was even / straight / contaminated, genetics.
Regardless, you should try to accept it. You've been through tough situations. The path ahead might be influenced by them, but not necessarily worsened.