Omg. This is me. I've been struggling with this thought process for awhile now--being angry with myself for breaking, that I should have been strong enough to handle it. Other people go through horrible things and come out okay, so why couldn't I?
I brought it up recently in one of my sessions and my therapist kinda got a little angry with me for even thinking like that. And got a little lecture about how everyone deserves to have a breaking point, and that there are also people who be gone through what I have and function much worse than I do. Wishing I had been stronger is one thing, beating myself up because "I broke" is another.
Also try to remember that children who grow up in abusive homes usually don't learn the coping skills children from healthy homes do. It's not inate, that stuff is taught, modeled, and parents intervene when their children are flooded and gradually allow them to take on more stressful situations as they mature. Kids from abusive homes tend to deal with a much greater amount of stress with significantly fewer coping skills at their disposal. For me, those skills were never built up until I began therapy.
Yet, unsurprisingly enough, my brother who has ptsd and is struggling horribly, I don't think less of. I don't blame him in the least for his struggles, I don't at all think he is weak for it, I empathize with him, and am incredibly angry with my father for destroying him the way he has. Sometimes, it takes me looking at my brother and how I feel towards him for me to get a clearer picture of how I should see myself. I seemed to do the same with abuse...I deserved it, until I stopped and looked at my brother and realized he never deserved that. And if he didn't deserve it, then neither did I. I guess we are all, unknowingly, incredibly and unfairly demanding of ourselves.