If you open up to someone and they get weirded out this bad, they probably weren't worth having in your life anyway, or at least aren't right now.
Granted, if you have actual past trauma, you should work on it with a therapist instead of your partner. And if your partner hasn't gone through something similar and can't relate at all, you shouldn't go into great detail about it. I disclose what the general trauma was about and leave it at that.
Fuck all that "Gary Cooper" John Wayne build walls bullshit.