I'm so sorry you had to endure all of this. My history is completely different from yours. But I have my own boatload of disturbing memories that keep washing back over me. So I think I perhaps have at least some small sense of what you're dealing with.

You asked how you can forget what you went through. But, of course, you can't. And trying to block the memories in some way or another is likely to simply cause them to keep coming back stronger & more frequently. What is likely to be best for you is going to be to explore all of this, at length & in depth, with the help of a skilled mental health therapist (assuming you're not already doing so.)

The primary technique I use for dealing with my own intrusive memories / thoughts is something called: compassionate abiding. Here's a link to a description of the practice:

https://mindsetdoc.wordpress.com/201...e-abiding-101/

And, beyond that, here are links to some articles, from PsychCentral's archives, on the subject of how to let go of a painful past:

https://psychcentral.com/blog/learni...ys-to-move-on/

https://psychcentral.com/blog/learn-...give-yourself/

https://psychcentral.com/blog/lettin...ful-over-time/

https://psychcentral.com/blog/how-to...nful-emotions/

https://psychcentral.com/blog/6-steps-to-serenity/

https://blogs.psychcentral.com/relat...-event-1-of-2/

https://blogs.psychcentral.com/relat...dium=popular17

My best wishes to you...