Thank you for your heartfelt account of what I can only describe as a nightmare. You and your whole family have endured such pain and suffered enormously with misfortune.
I can only say that you have remarkable inner strength to have survived the last 26 years - you acquired that the hard way and this is your foundation for a strong future. But first, there is the issue with trusting people...
Employment, relationships, even joining a social/sports club may be overwhelming and preventing you from overcoming your past. Could you start small and work up?
Attending a walking group or social sporting activity is a great way to ease into the 'system' as you are merely joining in, not specifically socialising, or even necessarily seeking sociable engagement. The steps are something like: public relations, social interaction, friendship, mutual support, career, relationship, marriage, kids...
Even just doing some volunteer work will see you interacting with staff and general public - you'll get the hang of it in no time, and you have much to offer with your experience of life.
Importantly, you are not your past. You have maturity and life skills to carry you through your next hurdle.
And you have already started your journey by reaching out on the forums - feel free to keep me posted or just have a chat whenever you choose.