How do I get over the feeling of my life being a waste because a decade of ptsd and depression?

The traumatic events and abuse by my parents started in childhood, but my life started becoming an actual living hell since I was 13 cuz bullying and sexual abuse came on top. I moved out as soon as I was 18 and tried healing. I’m turning 24 next month and it just made me realise my entire life was a waste and that I lost almost my whole life to abuse and ptsd. Even when there were good moments I couldn’t fully enjoy them because the ptsd/depression was silently eating me.

How do you get over the feeling of your whole life being a waste?