I Am Mentally Damaged Due To My Past

So sometimes I think different parts of my mind is stuck at certain ages. Like there is a part of me still stuck in high school. Another part in my early 20s. Another current, and just various points in my life along the way. I will see certain things in the eyes of the 16 year old that I was... for that moment I am 16. Other times I will see things as my 21 year old self. I am 21 at that time, there is no other part of me that is my current age. Everything is as it was when I was 21, same friends I had, same risks, same thoughts. It goes beyond nostalgia. I don't think it, I don't reminisce. I am as there as I can possibly be.

It is like some part of me had something traumatic happen and I will never fully leave that time period