Hi Kenna,
I'm sorry you're hurting and I'm sorry you're scared. Every scar and every body is different; it's possible your scars may still fade, but sometimes they don't, so know that it's possible some of yours might not fade all the way on their own. The best thing you can do is take really good care of your skin. For fresh wounds, practice good first aid -- keep the wound clean, use bandages, etc. For actual scars, you can use lotions and other skin care products that promote healing and general skin health (I like aloe vera gel; some people swear by products containing Vitamin E). If you can, it would be good to talk to a dermatologist about it--but I can imagine that might be difficult to do without a parent present, so if your parents don't know already, that might not be an option right now.
You may also want to check out some cover up options for the scars that may not fade:
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2021/7/self-harm-scar-cover…
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2021/9/self-harm-scars-in-t…
https://www.healthyplace.com/blogs/speakingoutaboutselfinjury/2022/1/is-self-harm-scar-re…
I hope that helps. If you have more questions, I'll be able to reply for as long as I am still writing for the blog.
Take care,
Kim