I’m really sorry to hear about David, I have a cousin like that and I thank god everyday for her. We used to not really get alone until I turned about 7 (shes’ about a year and 2 months other then me) but now we’re unsepartable. and when you talk about thinking your like everyone else I know what you mean. When I was little until I was maybe 4 I always insisted that my sibilings and parents had PK-you and I had PK-me and my mom couldn’t get me to understand I had PKU and they didn’t. Eventaully I began to understand.