I have self harm scaring on 80% of my arms and even scars on scars. they are a constant reminder if the past. is there any way of getting rid of them?

Therapy first: First you need assessment and treatment so you don't make any new scars with little information you are right candidate for dbt dialectic behavioral therapy.

Improve, not remove.: Scars cannot be removed but there is a large variety of techniques to improve their appearance, both surgical and non-surgical. They also improve with time. See a dermatologist or board-certified plastic surgeon to evaluate your options. Good luck!