I was brought up in care due to an abusive mother. I had a very bad time in care due to an abusive foster mother and her son.
Loads of stuff has gone wrong in my life, but I've always fought back and managed to improve my situation.
dh and his family are what I can 'normals'. Him and his sister had a good upbringing and there's no history of anything nasty. His sister is really nice and has a lovely job, dh, home, dcs etc.
I've been with dh for 11 years now and none of his family really know anything about me. He's always said that it's up to me to tell them things if I want them to know, but I just can't. SIL is a bit sentimental and only sees the good in people and I know she'd try and see things from my mother's point of view
even though it's blindingly obvious that my mother's nothing but a monster who should never have had children.
I don't see my half brother either due to the way his wife was towards me when I married dh 
I just have a trail of nasty people whom I've managed to dump, but I don't think that dh's family would understand.
I feel so isolated and not a real part of things. I feel like I'm carrying around so many secrets and they don't know the real me. I have some social phobia and some things that I can't manage to do (like crowds and shopping centres) and I try to hide this and I know they think I'm a bit 'funny'.