The foundation of all growth, personal and societal, is the voluntary suspension of disbelief that the future will proceed on it's current trajectory.
I'm sorry for everything that has happened to you. When I was your age, I had just gotten out of an abusive relationship where I was told everyday, for four years, that I was useless and worthless and stupid. And after all that time, part of me believed it. It took me years to stop the abusive self talk where I would hear their voice in my head, constantly deriding me.
When I did feel bold enough to try something, I ended up injuring my hands from an RSI really badly, and put myself out of commission for 10 months. And it was a loathsome 10 months, I was so angry with myself for behaving foolishly. But bit by bit I learned to open and close doors with my feet, went to physical therapy, and bit by bit I started to recover.
Nowadays I'm much happier. But I still feel I haven't done enough with my life, and that I want to accomplish so much more than I have. I still have episodes of depression and anxiety. When I do, I try to read that quote and other affirmations, and try to channel it into something constructive. It works as often as it doesn't; it's a work in progress.
The way you're speaking about yourself here is really abusive. Try not to do that; this is just one story, one interpretation of the facts of your life. What's past is prologue, not destiny. You can tell yourself the story of how that was where you came from and what you are overcoming.
There's so much time. I know how old and weary one can feel at 23, at any age. And there's truth to that feeling; you've experienced a lot, and a lot of it has been painful. But it has been my experience that failure is a part of life and a prerequisite for success, however you define that. You are not a failure. Like all of us, you are a work in progress.
Please feel free to reach out to me via the email in my profile if you'd like to talk. I'm not a replacement for a professional by any means, but the kindness of internet strangers with an empathetic ear has been helpful for me on my own journey, and I'm happy to repay the favor if it's useful to you.