Getting over emotional damage

Megan
So a few months ago I got out of an emotionally damaging relationship that was 6 years long. I didn't know it was hurtful because we were 15 when we met and didn't know anything else. I also recently moved on to a new great relationship. I never really realized that I had been emotionally scarred until my new boyfriend had mentioned that I was acting strange, like I apologized for everything and always acted like him spending time with me was a chore for him. In my last relationship my partner never wanted to spend time with me, I was his last priority, he said very hurtful things about my being an introvert and I felt I couldn't make new friends because if my own boyfriend didn't want to spend time with me why would anybody else. He was very selfish and almost hated when I was happy and seemed to like when I failed. Any problem I encountered was my own fault and he never felt sympathy for me. Just overall I felt like a terrible person that wasn't worthy of love. My new boyfriend never stops trying to make me feel better and undo everything that was done to me in the past, he is the most amazing man. I have confronted my past boyfriend about what he had done to me and he felt little to no remorse which was very hurtful. What would be your advice on how to get past time emotional damage especially without closure from my past partner?