Any kind of traumatizing event will shape and mold how a person views things for the rest of their lives. But just the simple act of forgiving, even if you are the only person who knows, is the first step of healing and moving on to better things. It's difficult and painful to do sometimes, but it will unload a burden that will feel so much better in the long run.
You will still always be cautious, and the walls of defense will be ever present, but that is what helps us persevere and move on.