Dear OP
You are totally justified in hating the hand life dealt you. In fact, i think I can see rage and bitterness in your posts, and I can understand why.
How to deal with it? Well, you have a choice: you can either continue to see your energy eaten up by anger and resentment, or you can decide that you still have time to use this energy to build the kind of life you would like.
Personally, I am not sure that I would want the life of a 20-something professional in Chelsea, and all that glitters is not gold in any case.
But i would say that you need to focus on identifying what exactly you feel you are missing, then think about how you could achieve it albeit perhaps in a different way? Is it prestige, social standing, respect, fame, money, job satisfaction, friends, exciting social life, or simply a very well paid job and a very comfortable lifestyle? Only you know.
One thing I can say is that you probably have another 30-40 years ahead of you. You have done really well with what you have achieved so far in the face if sych challenges. Now you can build on that by planning out what you want to do next.
If you don't grasp the bull by the horns now, you may well spend the rest of your life loaded with anger and bitterness. The choice is yours. In the past, there were points when you had choices and you now regret the choices you made. Identify the opportunities you have now (because there are opportunities out there, even if grasping them might be a lengthy process). Visualise the life you want in say, 20 years, work out what the components are, and actively choose to start the process of working towards that life. You may get there fully or you may not. But the alternative of expending so much energy on continued bitterness and anger is pretty grim. It's up to you which road you choose.
I am in my early 60s now. I have not have had the awful experiences you have, but I did have inadequate parents and poverty when I was a child. I was also a child tipped for the top and was the first in my family to go to university, which was an achievement, but with better guidance and contacts (and family money) I might well have achieved much more than I have. It was easy to look back and blame other people and my circumstances but by the time I was in my mid 30s I realised that this was getting me nowhere and was actually harmful. So I made positive changes, not all of which were easy, and made things better. Now in my early 6Os, I don't regret the choices I made in my 30s even if they didnt all pay off. I developed a much clearer understanding of the things I wanted and valued, which for me were not money but things far more related to having work and voluntary work I am proud of doing, having built up skills and experiences which i can continue to build on to do more of the things I want to do, and a set of values which I try my best to live by. It is far from perfect but for me 'good enough' is also an achievement.
Good luck, OP. I hope you can put your talents and energy into things which will bring you fulfilment, whatever you feel these are for you.