As a mental health advocate, former social work professional, and former mental health professional, I would encourage you to give yourself a break on the Peter Pan Syndrome tag, and pick up a new one. Peter Pan Syndrome is a discredited pop psychology term that stigmatizes men who usually have something else going on.
I would encourage you to investigate Complex Post Trauma Stress Disorder. It is different from ordinary Post Traumatic Stress Disorder. It applies to children who have grown up under long-term, chronic trauma like abusive parents, foster care, violent environments, etc. There are associated personality traits that go along with C-PTSD and some of them describe delinquent behavior. But, what C-PSTD does is give you something to treat, something to focus on building skills to counteract. You’re an amazing writer and artist. You’ve been through a lot. Consider stopping yourself from accusing yourself of having a syndrome that blames you for being immature, and look to one that actually explains what happened to you.