I know exactly what you are talking about, I feel the same way, although it's all really hard to explain. I was told I had adult-child syndrome. But I also think it's part of my flashbacks, some of them make me feel the way I did when I was 12. I can't have a relationship because I feel like a kid in intimate situations and I feel disgusting. I think I can't have sex because I keep remembering that I was a child once and it makes me feel so dirty. I can't think of ME doing that. Around certain people I feel different, like a different person. Some people I'm really confident around, almost *****y, others I'm really hyper, others I feel really insecure and small. It frustrates me so much.