There is also meant to be medical makeup available now specifically for people who self harm or have unsightly
scars, I seen a video online of a girl being taught
how to best apply it and conceal her scars best, but goodness knows where it's available and you'd probably go through a lot if both arms are scarred. Plus it isnt really long term.
Your scars are a part of who you are, but I understand that you dont want them to define you.