I don't know how to fix my life anymore.
JT -- I know that you are devastated right now. And, I empathize with you completely. I hope I can write some words that give some relief -- if not today, then someday soon.
You are not "broken" -- in fact, there are millions of people in the same boat as you right now, and there are treatment (management) options as well as options for protecting yourself (and future partners). Your brain is taunting you by living in what is sometimes called "the wreckage of the future." But, living in the imagined future can destroy your life in the present.
The mind and heart can be trained. What you think and ponder can (and often does) become habituated. Therefore, pause for a moment.
"Confirmation bias" is a real cognitive trick (error). Whatever your belief is, often becomes the lens through which you view the world. If you think of yourself as broken, you handicap yourself.
You are not broken. Yes, you have a challenge. But, that challenge can be addressed -- medically, therapeutically, cognitively, and emotionally.
You are not alone. Please start with kindness for yourself.